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Drug release technologies have become a major driver of pharmaceutical innovation. A JAMA Network Open study of novel drugs approved between 1995 and 2021 found that nearly 40% were later reformulated, highlighting the growing role of formulation engineering in pharmaceutical innovation.[1]&nbsp;



While some release profiles are driven by API constraints, others are designed to improve patient experience. Meta-analyses show that patients receiving once-daily dosing had 22% to 41% more adherent days compared with patients receiving thrice-daily dosing. [2] In practice, this is more than just clinical nuance: for an equivalent efficacy, a medication that can be taken once a day instead of twice is preferred by patients and more likely to be prescribed. From an industry perspective, these differences can lead to improved product differentiation and stronger market adoption.&nbsp;



To illustrate this concept, let us explore how different oral solid dosage (OSD) formulations address specific patient, therapeutic, and formulation challenges through distinct drug release strategies.



Immediate release formulation: maximizing rapid drug availability&nbsp;



Following administration, an immediate-release (IR) dosage form rapidly disintegrates, releasing the API into gastrointestinal fluids for absorption in the upper gastrointestinal tract. It is particularly suited to APIs that are stable under gastric conditions and to therapeutic areas where a rapid onset of action is required. By minimizing the delay between administration and absorption, immediate-release formulations deliver fast therapeutic benefit and remain the benchmark for many oral solid dosage (OSD) products.&nbsp;



As the most common oral dosage form worldwide, immediate-release tablets are used in many of the world's best-known medicines, including paracetamol products.&nbsp;



From the patient's perspective, the value is clear: rapid symptom relief and a simple dosing experience. For the formulator, however, achieving a rapid and reproducible drug release profile requires balancing several critical parameters, including disintegration time, tablet robustness, palatability, and API loading. A widely used combination includes lactose monohydrate as a filler, Povidone as a binder, and croscarmellose sodium as a Superdisintegrant. This combination allows fast drug release thanks to lactose monohydrate wettability and Croscarmellose sodium swelling properties while maintaining strong integrity due to Povidone high binding efficiency. Beyond excipient selection, their concentration is equally critical. Typically, binder concentration management directly influences compression behavior and, in fine, tablet performance.&nbsp;&nbsp;



The formulation shown below is an example of efficient immediate release composition.&nbsp;







For coated tablets, the challenge shifts to improving swallowability and handling without significantly delaying drug release. Ready-to-use coating systems such as Aquarius Genesis help achieve this balance by providing an elegant coating solution while simplifying processing for formulators and using less water per batch for a more eco-conscious formulation.



Sustained release formulation: extending therapeutic coverage



Sustained release is achieved by controlling the rate at which the API dissolves, diffuses, or leaves the dosage form thanks to a polymer matrix. When exposed to gastrointestinal fluids, the polymer hydrates and forms a gel layer around the tablet. This gel barrier regulates water penetration and API diffusion, allowing formulators to tailor the release kinetics according to therapeutic objectives. Additional polymers and matrix-forming agents can be combined to further adjust swelling, erosion, and release mechanisms.



The main excipients commonly used in sustained-release matrix systems are summarized below.







By reducing concentration peaks and delaying drug elimination, this approach can help maintain therapeutic efficacy while minimizing dose-related adverse effects which makes it particularly suitable for APIs with a short biological half-life, therapies requiring prolonged activity, or molecules with a relatively narrow therapeutic window. For example, some antiepileptic drugs are typically sustained release medication to avoid neurotoxicity while maintaining seizure control.



The impact of sustained release can be clearly illustrated by the dissolution study performed in our application laboratory. Compared with an immediate-release formulation, drug release occurs more gradually and remains incomplete over the same timeframe. After two hours, the immediate-release tablet had released 100% of its API, whereas the sustained-release formulation released less than 60%, avoiding the pic concentration.







While reducing dosing frequency can improve convenience, sustained-release formulations also introduce specific patient considerations. These dosage forms are generally not intended to be chewed, crushed, or split, as altering the tablet structure may significantly modify the release profile and compromise both safety and efficacy.



Enteric and Colonic Drug Release Achieved Through Tablet Film Coating&nbsp;



Functional film coating is a widely used strategy for targeting drug release to specific regions of the gastrointestinal tract. Among the most common applications are enteric release and colonic release, which make it possible to either protect the active ingredient or the stomach, and to deliver the drug to the colon before release&nbsp;of the active&nbsp;occurs.&nbsp;



Enteric Drug Release: protecting API and Optimizing Absorption&nbsp;



Some active ingredients cannot survive gastric acidity, and others irritate the stomach lining. Enteric coating with a methacrylic acid copolymer solves both problems at once. Impermeable below pH 5.5, the film dissolves as soon as the tablet reaches the duodenum (pH ≥&nbsp;5.5), releasing the active ingredient exactly where it needs to be.&nbsp;&nbsp;



For example,&nbsp;Omeprazole, one of the most prescribed drugs in the world, owes its therapeutic revolution in the 1990s precisely to this type of technology.&nbsp;



The performance of an&nbsp;enteric coating&nbsp;system&nbsp;largely depends on the selected polymer, weight gain and coating processes.&nbsp;Ensuring&nbsp;smooth&nbsp;film adhesion to the core tablets or pellets&nbsp;guarantees that the core will be protected from acidic conditions.&nbsp;This is why addressing the roughness of the tablet/pellet cores is important prior to the coating process.&nbsp;Commonly used enteric polymers include methacrylic acid copolymers hydroxypropyl methylcellulose phthalate (HPMCP), hydroxypropyl&nbsp;methylcellulose acetate&nbsp;succinate (HPMCAS), and cellulose acetate phthalate (CAP).&nbsp;&nbsp;



One of the easiest&nbsp;ways&nbsp;to perform enteric coating is to&nbsp;simply resuspend in water&nbsp;a ready to use mixture&nbsp;of methacrylic acid copolymers, like Aquarius Control ENA,&nbsp;and apply to the tablets or pellets.&nbsp;It is also possible to formulate internally&nbsp;the entire coating suspension (example showcased on the table below).&nbsp;&nbsp;







After coating, tablets or pellets disintegration profile needs to be compliant with USP &lt;701> or European pharmacopeia 2.9.1. An example performed internally is showcased on the graph below. 







Colonic Drug Release&nbsp;: Precision Targeting through functional coating



Reaching the colon by oral route is a precision challenge. Methyl methacrylate-based copolymer sensitive to neutral-to-slightly-alkaline pH (dissolution from pH 7) enables targeted release in the distal colon. Which is ideal for inflammatory bowel diseases (IBD) such as ulcerative colitis, where local action takes precedence over systemic delivery.&nbsp;&nbsp;



For example,&nbsp;Mesalazine&nbsp;with colonic release, developed in the 1990s, significantly reduced the systemic side effects of IBD treatments, opening a new era in digestive pharmacology.&nbsp;



Colon targeting can be achieved through several coating strategies:&nbsp;




pH-dependent systems, using polymers that dissolve only at higher pH values, typically above pH 7. 



Time-dependent systems, where film coating controls the lag time prior to drug release. 




Colonic coating technologies help minimize drug exposure in the upper gastrointestinal tract, improve local therapeutic efficacy, and reduce systemic side effects.&nbsp;



An example of colon release coating formulation is described below, as well as an example of tablet disintegration results after colon coating.&nbsp;&nbsp;











Your Formulation Partner for Precision Drug Release



Precision drug release is a strategic lever for both clinical innovation and commercial success. Each release approach addresses specific therapeutic, patient, and formulation challenges, creating opportunities for product differentiation in an increasingly competitive pharmaceutical market. As your partner in innovation, Safic-Alcan combines formulation expertise with a broad portfolio of excipients and technologies to help transform patient needs into effective, high-performing drug products.





REFERENCES



[1] Approvals and Timing of New Formulations of Novel Drugs Approved by the US Food and Drug Administration Between 1995 and 2010 and Followed Through 2021



[2] Effect of medication dosing frequency on adherence in chronic diseases.The American Journal of Managed Care, 01 Jun 2009






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Navigating Oral Drug Delivery Strategies in a New Way

Precision Drug Release: Pharmaceutical Formulation Engineering for Patient-centric Oral Drug Delivery     


Pharmaceutical manufacturers are facing a clear challenge: innovate faster, secure supply and reduce environmental impact, all without compromising quality or performance.&nbsp;



At CPHI Milan 2026, these priorities will take center stage. As a distributor and market connector, Safic-Alcan brings together partners whose expertise helps turn these industry pressures into concrete solutions, from bioprocessing and API sourcing to packaging and sustainability.&nbsp;



Innovation beyond Drug Discovery&nbsp;



Pharmaceutical innovation is not only about discovering new therapies. It also depends on the ability to manufacture them reliably, scale them efficiently and turn complex molecules into consistent, high-performing products.&nbsp;



This is where process expertise becomes critical. In biopharmaceutical manufacturing, fermentation and cell culture can be highly sensitive to operational variables. As Biopharmaceutical innovation advances, the pressure on manufacturers has become more intensive.&nbsp; Knowing that fermentation is about 60 % percent of biopharmaceutical process in 2024 [1], critical process parameter like foam management becomes more than simple operational concern. This foam appears typically in cell culture and fermentation processes due to excessive aeration or over mixing and can compromise yield, batch consistency, process monitoring and cost of goods. With this issue in mind, Momentive develops antifoam technologies that help biopharmaceutical producers improve process stability and support more reliable scale-up from development to commercial production.&nbsp;&nbsp;



Innovation also happens at the API manufacturing stage. As pharmaceutical companies look for greater consistency, purity and process control, fermentation-based APIs continue to play an important role in modern drug production. With its expertise in fermentation technologies, Shengli offers high-quality APIs, improved batch-to-batch consistency and more predictable industrial performance.&nbsp;&nbsp;



Finally, formulation performance often depends on what happens on a granulometric level. A promising formulation must not only work in the lab but also be reproducible at industrial scale. Through micronisation, grinding, sieving and particle size characterization services, Lab-Service helps formulation teams control particle size distribution, dissolution behavior and powder flow. The objective is not simply to make particles smaller, but to make better drug performance by improving dissolution rate and API bioavailability. It also supports more predictable batch quality and makes scale-up less risky.&nbsp;&nbsp;



Together, these partners show that innovation in pharma is not limited to the molecule itself. It also lies in the processes, ingredients and technical controls that make pharmaceutical manufacturing more reliable.&nbsp;



Operational resilience Building Resilient Pharmaceutical Supply Chains&nbsp;



Geopolitical uncertainty and regulatory complexity continue to challenge pharmaceutical supply chains. As a distributor operating globally, Safic-Alcan sees resilience becoming a strategic priority rather than a purely operational concern.&nbsp;&nbsp;



Through GMP-aligned manufacturing, process control and continuous improvement programs, Shengli helps customers strengthen both supply security and operational predictability.&nbsp;&nbsp;



Supply chain excellence also extends beyond ingredient sourcing. Packaging plays an increasingly important role in protecting product quality throughout transportation and storage. When sensitive ingredients travel across continents, packaging becomes a critical defense against environmental stress, contamination and product degradation. Our partner Tournaire manufactures aluminum packaging solutions that are designed not only to contain products, but also to protect them against environmental stress, preserve quality, and maintain integrity throughout storage and transportation. For sensitive pharmaceutical ingredients and healthcare materials, packaging becomes an active contributor to supply chain performance rather than a passive container.&nbsp;



Sustainability as Competitive Necessity&nbsp;



Sustainability is no longer a standalone initiative. It is increasingly integrated into supplier selection, product development and supply chain decisions across the pharmaceutical industry.&nbsp;



Among our partners, Momentive is advancing supply chain decarbonization through initiatives focused on Product Carbon Footprints and supplier engagement programs, contributing to greater transparency and supporting Scope 3 emission reduction efforts.&nbsp;



Their sustainability strategy is structured around three pillars: People, Products, and Planet. They believe sustainable growth is achieved when these three dimensions advance together rather than independently. One of the most important areas of focus is climate action and decarbonization. To help address this challenge, Momentive has joined Together for Sustainability (TfS), a leading initiative within the chemical industry aimed at improving sustainability performance across global supply chains. A major component of our approach is Product Carbon Footprints (PCFs). We actively engage suppliers to improve carbon footprint measurement and reporting because meaningful decarbonization requires accurate data. By encouraging the use of recognized methodologies and platforms such as SiGreen and the TfS Product Carbon Footprint Guideline, they aim to build greater transparency while supporting Scope 3 emission reduction efforts.&nbsp;



Sustainability also requires innovation in packaging design and manufacturing. Tournaire supports a more circular pharmaceutical supply chain through highly recyclable aluminum solutions alongside continuous improvements in resource efficiency.&nbsp;



In their process, they also continuously optimize our operations by reducing water and energy consumption, recycling industrial waste, and treating wastewater on site. Producing 100% of their aluminum packaging in Grasse, France, helps strengthen proximity to French and European customers while limiting transportation impacts.&nbsp;



Your Partner in a Transforming Pharma Industry&nbsp;



While the challenges facing the pharmaceutical industry continue to evolve, a common theme emerges across all three CPHI priorities: success increasingly depends on collaborative ecosystems. Whether improving bioprocess efficiency, securing critical supply chains or advancing sustainability goals, innovation rarely happens in isolation. As a distributor and market connector, Safic-Alcan works with partners that help pharmaceutical companies address these industry challenges and transform them into growth and opportunity.&nbsp;







REFERENCES



 [1] Biopharmaceutical Fermentation Market By Product Type (Microbial Fermentation, Mammalian Fermentation); By Application (Vaccines, Monoclonal Antibodies, Recombinant Proteins, Insulin and Hormones, Gene Therapy Vectors); By End User (Biopharmaceutical Companies, Contract Development &amp; Manufacturing Organizations, Academic &amp; Research Institutes, Government &amp; Nonprofit Entities); By Geography, Segment Revenue Estimation, Forecast, 2024–2030






CPHI 2026: Meet us and our partners at booth 1A10 

Leading the way to CPHI Milan 2026: partnering for the future of Pharma 


In June 2026 we have asked formulators attending one of our webinars this exact same question.The majority of them have answered, and picked the same option: that a preservative-free claim means the product is preserved with an ingredient outside Annex V.



That answer is everywhere in the industry. It is also only half the test, and the missing half is where brands get caught.



Start with what the law does not say. Regulation (EC) No 1223/2009 never defines "preservative-free". It does not ban the term. It does not oblige you to use an Annex V preservative at all. Article 10 asks for something different: a documented safety assessment showing the product is safe under normal and reasonably foreseeable use. Annex V is a positive list of what is permitted, with conditions attached to each of its roughly sixty entries. It is not a shopping list you are required to buy from.



The constraint on the wording sits elsewhere. Article 20 prohibits misleading information. Commission Regulation (EU) No 655/2013 then sets six common criteria that every claim must satisfy: legal compliance, truthfulness, evidential support, honesty, fairness, and informed decision-making. The Commission's Technical Document on Cosmetic Claims interprets how those six apply to "free from" wording specifically. Its Annex III has applied across Member States since 1 July 2019.



So the question a formulator should ask is not is my multifunctional listed in Annex V. It is what is that multifunctional actually doing in my formula.



Why a preservative-free claim is not an Annex V question?



A substance added to a cosmetic in order to inhibit microbial growth is regulated as a preservative and has to be assessed as one. That is the logic of the list, and you can check any individual entry in the Commission's CosIng database.



Plenty of substances with real antimicrobial activity sit outside it. Caprylyl glycol, 1,2-hexanediol, glyceryl caprylate, ethylhexylglycerin, levulinic acid, anisic acid, ethanol. Each has a legitimate primary function, emollient, humectant, solvent, deodorising agent, pH adjuster, and using them on that basis is entirely lawful. Nobody is suggesting otherwise.



The wording is a separate matter. Under the truthfulness and honesty criteria, a claim is assessed on how the average end user will read it. A consumer reading "preservative-free" understands nothing in here stops bacteria growing. If your formula depends on a multifunctional system to pass its challenge test, that reading is wrong, and the gap between the two is the enforcement exposure. Two brands can use the identical multifunctional at the identical level, and only one of them is leaning on it for microbiological protection. The INCI list cannot tell them apart. Your challenge test data can.



There is a second problem that gets less attention. Annex III of the Technical Document also addresses claims that denigrate lawfully permitted ingredients. This is why regulators cooled on "paraben-free": methylparaben and ethylparaben are permitted at up to 0.4% each and have been repeatedly reaffirmed as safe in SCCS opinions, so a claim built on their absence disparages an authorised group. The same reasoning is available to an authority looking at a blanket preservative-free flash on a carton.



Three preservative-free positions that hold up



Describe the system instead of the absence. "Preserved with a multifunctional system" and "formulated without Annex V preservatives" are both truthful, both survive the six criteria, and neither denigrates anything. They are duller. They are also not withdrawable.



Earn a genuine low-risk classification. ISO 29621:2017 sets out how to determine that a product presents a low microbiological risk. The usual anchors are water activity below 0.75, where most organisms cannot grow, and below 0.60, where essentially none can; ethanol above roughly 20%; and pH at or below 3 or at or above 10. Anhydrous balms, powders, solid perfumes and high-alcohol systems can genuinely fall here. Where you can document it, the position is a physicochemical property rather than a marketing line. The safety assessor still signs it off, and many will still ask for testing in borderline cases between 0.60 and 0.75 aw.



Generate the data, then write the wording. EN ISO 11930:2019+A1:2022 inoculates five standard organisms (S. aureus, E. coli, P. aeruginosa, C. albicans, A. brasiliensis) and measures log reduction at days 7, 14 and 28 against two acceptance criteria, not four. Criterion A is the target. Criterion B is the lower bar, and the standard accepts it only where you can additionally justify that the product is sufficiently protected, typically through packaging or conditions of use. It is not a rinse-off allowance. Without that data, or a documented ISO 29621 exemption, a product carrying no Annex V preservative has an incomplete Article 10 safety assessment. A short shelf life does not substitute for it.



The routes compared, with their claim exposure



Concentration limits below are the current Annex V maxima. Verify any entry against CosIng before it goes into a CPSR, since entries move.



Only two of the six routes leave a preservative-free claim exposed. Limits are current Annex V maxima; verify in CosIng before use in a CPSR.



For the full Annex V picture, including parabens, formaldehyde releasers and the 2026 amendments, see our EU regulatory guide to preservatives in cosmetics.







Where this framework falls short



Two weaknesses, and both matter more than the neat structure above suggests.



The Technical Document on Cosmetic Claims is guidance, not law. It was agreed by a sub-working group, it says so itself, and only the Court of Justice can give an authoritative interpretation. National authorities have signalled they will apply it and several do, but not uniformly. The practical consequence is uncomfortable: you can sell a preservative-free product in one Member State without incident and be challenged in another with identical packaging and an identical formula. No formulator can engineer that away. It is a commercial risk call, and it belongs to regulatory affairs and the brand owner rather than to the bench.



The second weakness is in the chemistry. pKa reasoning tells you reliably when an organic acid cannot work. It tells you very little about whether it will. A benzoic acid system at pH 4.5 sits comfortably inside its theoretical window and can still fail, because the acid partitions into the oil phase, or gets sequestered into non-ionic surfactant micelles, or the botanical extract load is feeding the organisms faster than the acid suppresses them, or water activity is higher than anyone measured. None of that appears in a pKa calculation. The theory takes a shortlist of twenty candidates down to four. It does not replace the challenge test, and any article that implies it does, including this one if you read it that way, is doing you a disservice.







What to test first



The order matters more than the choices, because it eliminates most candidates before you spend a day on microbiology.




Set pH before you set the preservation system. If the formula has to sit above pH 5.5, organic acids are out as the primary route. Establish that first rather than proving it over three weeks.



Check ISO 29621 before assuming you need protection at all. A meaningful share of briefs described as preservative-free are simply low-risk products that never needed the argument in the first place. Measure water activity early.



Screen two or three systems, and keep an Annex V control. Include it even when the brief forbids it. If the preferred system fails and the control passes, the problem is the preservation system. If both fail, the problem is the formula.



Run the challenge test on the final formula in the final pack. Packaging changes the outcome, particularly for anything airless or unit-dose. Testing a bulk sample and shipping a different closure is a common and expensive mistake.



Write the claim last. Decide the wording with the challenge test report in front of you, never in the brief. Reversing that order is the single most frequent cause of launch delay in this area.




The deeper technical background on growth conditions and hurdle strategy sits in our article on microbiology and preservation in cosmetics, and the 2026 Annex V amendments are covered in what's changing in Annex V.



Safic-Alcan distributes preservation and multifunctional ranges spanning organic acids and their salts, phenoxyethanol systems, multifunctional glycols and glyceryl esters, aromatic alcohols, and natural-origin acid systems compatible with COSMOS and NATRUE, alongside the emollients, solubilisers and rheology modifiers that determine how any of them behave in a real formula. Our cosmetics application specialists work this trade-off daily. Bring us a brief before you commit to a pH






Discover our online Cosmetics catalog

What "preservative-free" means in the EU, and what you can actually claim


A healthy and young-looking skin starts with the right sun protection. Sunscreen products are designed to deliver effective UV protection against both UVA and UVB rays, helping to minimize skin damage caused by prolonged UV radiation exposure. Their efficacy is typically expressed through the sun protection factor (SPF), a key indicator of protection performance.



Sunscreen is used to protect the skin from the sun's ultraviolet (UV) radiation and comes in many forms, including lotion, cream, gel, and spray. Sunscreen is applied to the skin before going outside and should be reapplied every two hours, or after swimming or sweating.



Creating either a sunscreen product with a high enough SPF or a daily skin care product with SPF rating to provide effective protection from UV rays can be linked to solving a jigsaw puzzle; the formulation process can be tricky, difficult and often lead you in unexpected directions.



Depending on the active ingredients and other base ingredients used, formulators might face significant aesthetic, stability and performance challenges when trying to formulate high SPF products. That's why improving the skin feel and spread of the sunscreen are key components for making sure that your sunscreen provides optimal sun protection. Moreover, consumers are increasingly embracing sustainability and natural cosmetics, raising expectations for sun care products that are as eco-conscious as they are effective.



How can we improve SPF, Skin Feel and Spreadability?



When formulating a sunscreen, it is essential to consider how it will perform on the skin. Sunscreens that provide high protection must also be comfortable to wear. Developing a successful sun care formulation requires balancing sensory appeal with performance. Modern consumers increasingly expect broad-spectrum protection combined with pleasant aesthetics and sustainable ingredient choices.



Here are some tips on how to improve the skin feel and spreadability of your sunscreen formula:




Use emollients : Emollients are fatty substances that can be used to reduce tackiness, help the sunscreen spread more evenly and improve hydration. Look at our portfolio to choose the right emollient for your sunscreen formulation. There are various ingredients like for example LIPEX® SheaSolve™, HARMONIE™ NATUDERMA EMOLLIENT, Neossance™ Hemisqualane, Saboderm AB and many more.



Use Film Former : Film formers enhance sunscreen performance by creating uniform, durable films on the skin. Technologies such as Nouryon's Structure® polymers, Dermacryl® film formers, Eastman AQ™ polymers, and SolAmaze® Natural improve UV filter distribution, SPF performance, water resistance, and long-lasting protection while maintaining desirable sensory properties. Film formers also contribute to better distribution of sunscreen agents on the skin, creating a more homogeneous protective layer and improving overall SPF performance through ingredient synergy.




Considerations When Selecting Other Ingredients for Sunscreen Formulations



In addition to UV filters, other ingredients such as antioxidants, preservatives, fragrances &amp; colorants can affect the stability of your sunscreen formulation. Enhancing stability through pH adjustment can help maintain effectivity of active ingredients within the formulation. Actives protect the skin of UV damage before and after sunbathing. Plant extracts can help protect the skin barrier against photodegradation and oxidative stress. Pongamia Extract from Givaudan, a sustainable extract, rich in pongamol, natural powerful antioxidant, from the indian Karanja tree, can be perfectly used for this. Izayoi and Springmint are active ingredients from Ichimaru Pharcos that can also be used. They prevent sunburn and inhibits inflammation and improve skin elasticity, increase water content in stratum corneum and recover skin roughness. Antioxidants are particularly valuable because they help neutralize free radicals generated by sun exposure and environmental stressors. Combined with suitable actives, they support overall skin defense mechanisms beyond traditional sunscreen protection.



Optimizing viscosity with thickeners offers better spreadability on application. To create soft gels, to stabilize an emulsion or to prevent waxes crystallization our Estogelgreen from Solabia can be used. An alternative is our clear and transparent Xanthan Gum Safic´ Care T XG Clear P from our Safic' Care Range with great texturizing and thickening properties. Alginate can also be used as Thickening and Gelling with pseudoplastic behavior. Carrageenane are Gelling Agents with thixotropic behavior. Both stay clear in Ethanol based Sunscreen Sprays and there is no neutralization required. Ingredient selection should also consider product stability and shelf life, especially when formulating high-SPF products intended for long-term consumer use.



In order to ensure compatibility between all components within your formula you can use materials or agents that serve as emulsifiers. A perfectly adapted solution would be our cold-processable liquid emulsifier PELLICER™ LB-30G from Asahi Kasei. The Sabowax PIS from SABO is a water in oil emulsifier which can also be used for liquid emulsions, and the Sabowax GMS SE MB is based on glyceryl monostearate. Lastly, FLUIDIFEEL™ EASY from SEPPIC is a natural, cold processable O/W emulsifier adapted to a wide range of viscosity, leaving a light and pleasant after-feel, perfect for sun care products. Certain emulsification systems are particularly effective when incorporating a complex combination of UV filters, helping to maintain stability while optimizing protection and sensory performance.



Looking for a high-efficiency SPF Booster? Check out our selection of skin-safe and UVA-safe products for the perfect formulation.



Today, SPF booster is a game-changer in the world of sun protection. SPF boosters are special ingredients that are used to enhance the effectiveness of sunscreen products. These boosters help to increase the effectiveness of the sunscreen in providing protection from the sun's harmful rays. They are normally added to the formula in small amounts and can include ingredients such as the Covabead Crystal, the Sensi OP White and the Sensisorb Biomim from Sensient which all display a unique combination of light reflection properties and sensorial impact: SPF Boosting and Anti- Blue Light protection.



SPF boosters can enhance the interaction between different sunscreen agents, creating additional synergy within the formulation. This approach may help formulators reach target SPF levels while maintaining elegant sensory properties.



The Role of UV Filters in Sunscreen Formulations



Creating sunscreens with a high SPF rating brings both aesthetic and performance challenges for cosmetic formulators. Aesthetically, a product should spread easily and be pleasant to use, while performance-wise it must offer adequate protection from UV rays. While increasing the SPF level of sunscreens has traditionally been associated with a greasy texture and an unpleasant feel, selecting the right combination of ingredients can help you overcome these challenges. Effective sun care products should provide broad spectrum protection across a wide wavelength range to ensure defense against both short and long UV rays. Achieving balanced coverage of UVA and UVB radiation remains a key objective for formulators.



In sunscreen formulations, UV filters act as active ingredients that absorb or reflect UV light before it reaches the skin. These sunscreen agents can be classified as organic sunscreens or inorganic filters. A typical chemical sunscreen relies primarily on organic sunscreens, which absorb UV energy through a mechanism of absorption, while mineral filters provide protection through reflection and light scattering.



For instance Neo Heliopan® 357 and Neo Heliopan® 303 from Symrise; and physical filters, such as zinc oxide and titanium dioxide. Eco friendly ready to formulate UV Filter such as our Resconcept Sunscreen products like the RESCONCEPT SUN SPF 30 ECO REEF, RESCONCEPT SUN SPF 50 ECO REEF&nbsp;are designed to responsibly protect your skin and are ready to use. They are formulated with an eco-designed texture to avoid harm for corals all over the world. UV TiO2 AS and Oxyde de Zinc Mircopur AS from Sensient provides a highly hydrophobic, shear resistant coating and improves the water resistance. They are easily dispersible and photocatalytic stable with an improved SPF, easier spreadability and less whitening. UV Filter Dispersions are another easy to formulate solution such as the G-Block and S-Block range from Applechem by Solabia. These are low viscosity dispersions with no sedimentation or re-agglomeration with a higher transparency in sunscreen formulations. The performance of mineral UV filters is strongly influenced by particle size, which can affect transparency, SPF efficiency, skin feel and overall aesthetics. Carefully optimized particle size distribution can improve protection while minimizing whitening effects.



Advanced SPF testing helps formulators evaluate the efficiency of different organic and inorganic filter systems and confirm protection levels before market launch. Modern SPF testing protocols also support the development of products delivering reliable UV protection under real-world conditions.



After Sun Care: Revive &amp; Refresh Your Skin with Our Premium Products



After sun is a type of product that is used to help soothe and cool the skin after it has been exposed to the sun. It can help to reduce the pain, redness, and swelling of sunburns, as well as help to rehydrate the skin and reduce peeling. After Sun can also be used to help protect the skin from further damage caused by the sun, such as premature aging or skin cancer. After-sun products are often enriched with soothing ingredients, moisturizers and natural oils to help restore skin comfort and reinforce the skin barrier following intense sun exposure.



It is usually applied directly to the skin and is made up of ingredients such as our Lava-Dermabiotics which is a Lava Sea water probiotic solution to strengthen the skin barrier. Another ingredient from Hyundai Bioland is Eucoolan which is an anti-thermal ageing ingredient. It inhibits thermal increase of skin and UV-induced sunburn pain as well as anti-inflammatory properties. DEXTRALIP® 10C is an exceptionally performing soothing active.



BisaboLife® and PrimalHyal™ Ultrafiller from Givaudan are also perfectly designed ingredients for after-sun applications.BisaboLife® helps calm irritated skin, reduce redness and support recovery after sun exposure. PrimalHyal™ Ultrafiller delivers intense hydration and improves skin comfort by replenishing moisture lost during sun exposure.



Achieving optimal Performance from your Sunscreen Formula



Creating a safe and effective sunscreen product requires special consideration for a variety of factors including skin feel, spreadability, stability and quality assurance testing. Creating a safe and effective sunscreen product requires special consideration for a variety of factors including skin feel, spreadability, stability and quality assurance testing. Successful sun care formulation development requires understanding the behavior of sunscreen agents, the selection of suitable organic and inorganic UV filters, and optimization through robust SPF testing. By carefully balancing filter systems across the relevant UV wavelength ranges, formulators can create products delivering reliable broad-spectrum protection while maintaining excellent aesthetics and consumer appeal.



Incorporating ingredients such as emollients and film-forming polymers into your sunscreen formula can help improve its comfort on the skin’s surface while increasing its efficacy in blocking UVA/UVB rays from damaging one’s skin. By carefully selecting combinations of organic and physical UV filters along with other ingredients such as antioxidants, preservatives, fragrances &amp; colorants, one can create an optimal sunscreen formula that provides an effective level of protection while feeling comfortable on the skin.






Get ready for Sunsational Fun in the Sun - with Protection


TL; DR: Sourcing specialty polyurethane prepolymers in Europe is&nbsp;not the same as&nbsp;sourcing commodity chemicals.&nbsp;Shelf-life&nbsp;constraints, temperature-controlled&nbsp;logistics, REACH documentation obligations, and the need for formulation-level technical support mean that distributor&nbsp;selection&nbsp;is a supply chain decision. The right supply partner reduces compliance risk, protects material quality, and ensures the technical continuity that&nbsp;component&nbsp;performance depends on.&nbsp;



When sourcing polyurethane prepolymers in Europe, material selection and sourcing strategy are inseparable. Specifying the right prepolymer grade for an application — the right polyol chemistry, isocyanate, hardness range — only delivers the expected service life if the material arrives on time, in specification, with the regulatory documentation&nbsp;required&nbsp;to use it in a European manufacturing environment. A well-specified material sourced poorly can fail in the supply chain before it ever fails in the application.&nbsp;



This guide is written for procurement managers and supply chain professionals sourcing&nbsp;polyurethane prepolymers in Europe — specifically&nbsp;the HYPERLAST™, DIPRANE™, VORASTAR™ and DURAMOULD™ systems by Dow. It covers the sourcing-specific considerations that sit between the chemistry decision and the production floor:&nbsp;logistics&nbsp;constraints, REACH documentation,&nbsp;shelf-life&nbsp;management, supplier qualification, and the practical implications of pan-European supply.&nbsp;



Prepolymer selection is covered in our article on high-performance elastomers. The chemistry decision behind each system is treated separately in our polyether vs polyester comparison, and wear performance in our article on abrasion resistance. Processors reformulating away from MbOCA should start with our MbOCA and REACH compliance article. The total cost case behind material selection is covered in our material ROI guide.



Why specialty PU prepolymer sourcing is more complex than commodity chemical procurement



Specialty polyurethane prepolymers sit in a different supply chain category from bulk commodity chemicals. Several characteristics make their procurement genuinely more demanding:




Shelf-life constraints. Most polyurethane prepolymers have a shelf life of 12 months from date of manufacture when stored sealed at temperatures below 25°C. Once opened, the isocyanate content (% NCO) can drop through reaction with atmospheric moisture, degrading the material and producing off-specification elastomers. This means procurement cannot treat prepolymers as stockable commodities with flexible lead times. Material needs to arrive on a schedule matched to consumption rate, and storage conditions must be actively managed.





Temperature-sensitive logistics. Most polyurethane prepolymers are liquid at elevated temperatures but may solidify or crystallise at ambient conditions, requiring heated or insulated containers, drums, and storage facilities for transport. This imposes additional cost and complexity compared to standard chemical logistics, and requires a supply partner with the infrastructure and experience to manage temperature-controlled distribution across European markets.





REACH documentation obligations. Under REACH Regulation (EC) No 1907/2006, procurement of hazardous chemical substances in Europe requires safety data sheets (SDS) to be provided at or before first delivery, and kept on file for at least 10 years. Procurement should require SDS from suppliers and ensure they are stored in an accessible system. For prepolymers containing isocyanates, which are classified as hazardous under CLP, this is a compliance requirement.





Technical support requirements. Customers increasingly demand value-added services from specialty distributors, primarily through product development and formulation support. A cast polyurethane prepolymer is not a finished product. It requires formulation expertise to translate into a component that performs as specified. A supplier who can only provide material, without system-level knowledge, application data, or reformulation support, creates a technical gap that the processor's team must fill alone.




REACH documentation: what procurement teams need to verify



For European procurement of isocyanate-containing prepolymers, REACH creates a set of specific documentation requirements that go beyond standard supplier qualification. The key obligations are:




Safety Data Sheets (SDS) in the language of the Member State. Under REACH, the SDS shall be supplied in an official language of the Member State where the substance or mixture is placed on the market. Procurement teams operating across multiple European markets need SDS in each relevant language — not a single English-language document applied globally.





Extended Safety Data Sheets (eSDS) with Exposure Scenarios. For substances sold in quantities above 10 tonnes per year and classified as hazardous, exposure scenarios must be appended to the SDS, forming an extended safety data sheet (eSDS). Downstream users must check that the exposure scenarios cover their own use and their conditions of use, or take alternative action. For isocyanate prepolymers, this is standard practice. Verifying that the eSDS received from the distributor covers the specific intended use is part of procurement’s scope.





SVHC and Authorisation status. Procurement teams must verify that no substance in the prepolymer supply chain is subject to REACH Annex XIV authorisation requirements without a valid, current authorisation covering the intended use. This is the MbOCA issue in practice: any processor still using MbOCA-cured systems without a current authorisation is in breach of REACH. The simplest compliance position is to source only from suppliers who can confirm their prepolymer systems are MbOCA-free — which is what the HYPERLAST™ 153 series and the broader Dow Polyurethanes range provide. The MbOCA compliance question is covered in detail in the dedicated REACH compliance article.





SDS update obligations. Suppliers must update the SDS without delay if new information on hazards or risk management measures becomes available, and provide updated versions to all recipients who have received the substance within the previous 12 months. A distributor who manages this proactively, pushing updates to customers rather than waiting to be asked, reduces the compliance risk that sits with the downstream user.




Supplier qualification: what to assess beyond price



Suppliers of specialty chemicals should meet clearly defined qualification criteria before being added to the approved supplier list — including relevant certifications such as ISO 9001 for quality management, and demonstrated compliance with applicable regulations such as REACH.



For polyurethane prepolymer procurement specifically, the qualification criteria that most directly affect supply reliability and performance outcomes are:



Pan-European supply: why geographic coverage matters



For manufacturers with production sites across multiple European countries (or procurement teams managing supplier relationships across different national operations), a distributor with genuine pan-European coverage simplifies the supply chain considerably.



A single authorised distributor covering France, Germany, the UK, Benelux, the Nordics, Spain, Portugal, and most CEE countries means consistent product specifications, a single REACH documentation framework, one technical support point of contact, and a single supplier qualification process that applies across all sites. The alternative is managing multiple national distributors for the same product range. That multiplies qualification overhead, creates inconsistency risk in SDS language versions, and fragments the technical support relationship.



Supply continuity is also relevant. A distributor with warehouse infrastructure across multiple markets can manage regional demand fluctuations, hold safety stock where needed, and respond to short-notice requirements without the lead times associated with trans-continental shipping. For specialty prepolymers with shelf-life constraints, local stock availability is a material quality issue.



Shelf life management in practice



Procurement teams who have not previously sourced polyurethane prepolymers sometimes underestimate the operational implications of the 12-month shelf life. A few specifics:




Order volume and frequency. Ordering in volumes that cannot be consumed within the shelf life creates waste and quality risk. Procurement should establish order quantities matched to production consumption rates, and communicate consumption forecasts to the distributor to enable responsive stock management.



FIFO stock rotation. In environments where multiple batches of the same prepolymer are held, first-in-first-out rotation is essential. Mixing batches with different manufacture dates — or consuming newer stock before older stock — accelerates effective shelf life consumption and increases the risk of NCO content degradation in partially used drums.



Nitrogen blanketing after opening. Partial containers of prepolymer should be re-sealed with nitrogen or dry air to prevent moisture contamination after each use. This requires appropriate equipment and procedure at the point of use, not just at the distribution stage.



Incoming quality checks. For high-criticality applications, NCO content verification on incoming batches provides assurance that material meets specification at point of receipt, independently of the manufacture date on the container.




Safic-Alcan as authorised European distributor of Dow Polyurethanes



Safic-Alcan is the authorised pan-European distributor of the complete Dow Polyurethanes range — HYPERLAST™, DIPRANE™, VORASTAR™ and DURAMOULD™ — across France, Italy, the United Kingdom, Benelux, the Nordics, Germany, Austria, Switzerland, Spain, Portugal, and most CEE countries.



The distribution agreement, extended to include DACH markets in April 2025, gives manufacturers across the continent access to consistent supply with local technical support in each market. For procurement teams, this translates into a single supplier qualification, a single point of contact for REACH documentation across all covered markets, and access to Safic-Alcan's technical team for grade selection, formulation guidance, and reformulation support — including the MbOCA transition to HYPERLAST™ 153 for processors still on TDI/MbOCA systems.



As a specialty chemicals distributor, Safic-Alcan provides the full documentation package required for REACH-compliant procurement: current SDS and eSDS in the languages of each market, certificate of analysis for each batch, and technical data sheets for all products in the Dow Polyurethanes range. Sample supply for qualification testing is available across all covered geographies.



Procurement checklist: sourcing cast PU prepolymers in Europe




Confirmed authorised distributor status for the product range required



ISO 9001 certification or equivalent quality management certification



Current SDS in the language of each market of supply, with eSDS where required



SVHC and Annex XIV status confirmed — MbOCA-free formulation verified



Temperature-controlled storage and logistics capability confirmed



Shelf life documentation (manufacture date) included with each delivery



Sample supply available for incoming qualification testing



Technical support access confirmed — formulation-level, not just product delivery



Pan-European coverage confirmed for all production sites requiring supply



SDS update process confirmed — proactive distribution of revisions to all supply recipients






Frequently asked questions



Where can I buy Dow HYPERLAST™ prepolymers in Europe?



Safic-Alcan is the authorised European distributor of the complete Dow Polyurethanes range — including HYPERLAST™, DIPRANE™, VORASTAR™ and DURAMOULD™ — across France, the UK, Benelux, the Nordics, DACH (Germany, Austria, Switzerland), Spain, Portugal and most CEE countries. Contact the local Safic-Alcan team for pricing, technical data sheets, samples and REACH documentation.



What documentation is required when sourcing polyurethane prepolymers in Europe?



Under REACH Regulation (EC) No 1907/2006, procurement of isocyanate-containing prepolymers in Europe requires a Safety Data Sheet (SDS) in the language of the Member State of supply, provided at or before first delivery. Where the prepolymer is classified as hazardous and sold in volumes above 10 tonnes per year, an extended SDS (eSDS) with exposure scenarios must be appended. Procurement teams must verify that the exposure scenarios cover their specific intended use. Certificate of analysis, technical data sheet, and SVHC/Annex XIV status documentation should also be requested and retained.



What is the shelf life of a polyurethane prepolymer?



Most polyurethane prepolymers have a shelf life of 12 months from the date of manufacture when stored sealed in original containers at temperatures below 25°C. Once opened, the isocyanate content (% NCO) can drop through reaction with atmospheric moisture. Partially used containers should be re-sealed with nitrogen or dry air after each use. Procurement should match order volumes to consumption rates to avoid holding material beyond shelf life.



What is an authorised distributor and why does it matter for polyurethane procurement?



An authorised distributor has a formal agreement with the manufacturer — in this case Dow Polyurethanes — giving them direct access to the full product range, current technical data sheets, extended SDS, and manufacturer technical support. Procuring from an unauthorised reseller creates risk: documentation may be out of date, access to the full grade range may be limited, and formulation-level technical support from the manufacturer is not available. For specialty prepolymers where documentation and technical support are integral to compliance and performance, authorised distributor status is a meaningful qualification criterion.



What are the REACH obligations for downstream users of polyurethane prepolymers?



Under REACH, downstream users of isocyanate-containing prepolymers must: receive and retain a current SDS from their supplier; verify that the exposure scenarios in any eSDS cover their specific use; comply with the risk management measures described in the exposure scenarios; report any use not covered by the received exposure scenarios to ECHA if above the one-tonne threshold; and retain all relevant documentation for at least 10 years. If the prepolymer contains any substance subject to REACH Annex XIV authorisation (such as MbOCA), the downstream user must verify that a valid authorisation covers their specific use or that the system is MbOCA-free.



Does DIPRANE™ require special storage or logistics conditions?



Yes. Like most specialty polyurethane prepolymers, DIPRANE™ and HYPERLAST™ systems require sealed, temperature-controlled storage below 25°C and protection from moisture. MDI-based systems in particular may require heated containers in transit to prevent solidification or crystallisation at ambient temperatures. Distributors handling these materials need appropriate logistics infrastructure. Safic-Alcan's European distribution network is equipped for temperature-sensitive specialty chemical distribution.



Can I source HYPERLAST™ and DIPRANE™ across multiple European countries from a single supplier?



Yes. Safic-Alcan operates as the authorised pan-European distributor of the Dow Polyurethanes range across 15+ European markets, including France, Italy, the UK, Benelux, the Nordics, DACH, Spain, Portugal and most CEE countries . A single supplier relationship covers multiple production sites, provides consistent REACH documentation across markets (including country-language SDS), and gives access to a single technical support team — simplifying both procurement administration and supplier qualification.



What should I look for when qualifying a specialty chemical distributor for polyurethane prepolymers?



Key qualification criteria include: authorised distributor status with the manufacturer; ISO 9001 or equivalent quality management certification; current SDS and eSDS capability in the languages of all required markets; confirmed MbOCA-free status for REACH compliance; temperature-controlled storage and logistics capability; shelf life documentation with each delivery; sample supply for incoming qualification testing; formulation-level technical support access; and pan-European coverage if supplying multiple sites.



REFERENCES : &nbsp;



Understanding REACH — ECHA &nbsp;



Extended safety data sheets and exposure scenarios — ECHA &nbsp;



REACH Annex XIV Authorisation List — ECHA &nbsp;



REACH Regulation (EC) No 1907/2006 — EU-OSHA &nbsp;



Polyurethane prepolymer shelf life and storage — Era Polymers



Polyurethane prepolymers market: logistics and supply chain — IndexBox



Why specialty chemical distributors need to raise their game — BCG &nbsp;



Chemical procurement best practices — Datacor


Sourcing high-performance PU prepolymers in Europe: what procurement teams need to know 


TL;DR: A cast polyurethane elastomer component typically costs two to four times more per unit than its rubber equivalent. In most industrial wear applications, the TCO calculation still favours polyurethane — significantly. The difference lies in service life, maintenance intervals, and the true cost of unplanned downtime. This guide gives procurement and operations teams the framework to build that case with numbers, not assumptions.



The conversation about material selection in industrial procurement rarely starts in the right place. It starts with unit price: a rubber roller costs less than a polyurethane one. A standard steel lining costs less than a cast PU equivalent. The purchase order looks better. The budget looks better. Six months later, the maintenance team is back on the production floor with a replacement.



Polyurethane total cost of ownership is the framework that closes this gap. It accounts for every cost associated with a component over its service life — not just the price on the purchase order, but the replacement cycles, maintenance labour, production downtime, logistics, and the compounding costs of unplanned failure. In wear-intensive industrial applications, TCO consistently tells a different story from unit price alone.



This article is written for procurement managers, plant managers, and operations directors who need to justify a material switch — or who need to understand why their engineering team is recommending one. It covers how to construct a rigorous TCO comparison, what the data shows across common industrial applications, and how the prepolymer system chosen drives the outcome. For the chemistry behind HYPERLAST™ and DIPRANE™ by Dow, see our article on high-performance elastomers.



The unit price trap: why purchase cost misleads



Unit price is the most visible number in a procurement decision. It is also one of the least informative metrics for components that fail through wear. The reason is simple: a component that costs twice as much but lasts four times as long does not cost twice as much. It costs half as much — before accounting for the labour and downtime associated with two additional replacement events.



Polyurethane typically costs 30–50% more than commodity rubber upfront. However, total cost of ownership analysis consistently favours polyurethane in demanding applications. The mechanism is service life: in high-wear environments, polyurethane components typically achieve three to five years of service life versus one to two years for rubber in similar conditions.



In mining conveyor applications specifically, polyurethane lagging delivers five-year service life versus one year for rubber lagging in abrasive ore handling — a 5x lifespan extension that directly reduces replacement costs by 80% over the equipment lifetime. Even a conservative 3x service life advantage eliminates two replacement cycles over a five-year horizon, with each avoided cycle removing a discrete maintenance event from the schedule.



The five cost categories in a rigorous TCO analysis



A complete TCO comparison for elastomeric industrial components covers five categories. Focusing on any one of them in isolation produces a misleading conclusion.



1. Acquisition cost



The unit price of the component, including any associated installation costs. This is where rubber and steel hold their advantage — typically a 2–4x lower purchase price per unit. It is the only category where polyurethane does not lead, and it is the one most likely to dominate a conventional procurement review.



2. Replacement frequency and cumulative material cost



The number of replacement cycles over a defined operating period — typically three to five years — multiplied by unit cost. Over a five-year horizon, a facility running polyurethane components requires roughly three to five full replacement sets. The same facility using rubber requires ten to twenty. Even at a 2–4x higher unit cost, the cumulative material spend on polyurethane is typically 40–60% lower than the rubber alternative over five years. This inversion — where the more expensive component produces lower lifetime material cost — is the foundation of the TCO case.



3. Maintenance labour



Each replacement event requires maintenance labour: scheduling, equipment access, part removal, installation, and re-commissioning. In many industrial environments, this labour is both expensive and constrained. Fewer replacement cycles means fewer maintenance windows, lower labour expenditure, and less demand on already stretched maintenance teams.



This cost is rarely captured in component budgets but it is captured in maintenance budgets — and it is real. For procurement teams, polyurethane's durability often translates into longer service intervals: fewer replacements mean less downtime, lower labour requirements, and reduced lifecycle costs for the equipment.



4. Unplanned downtime



This is the cost category that most dramatically changes the TCO outcome — and the one most consistently absent from conventional material selection reviews.



Component failure in industrial operations rarely happens at a convenient time or in a convenient sequence. When a roller lining fails mid-shift on a continuous processing line, the production line stops. When a seal fails in a wet processing environment, the shutdown may extend far beyond the component replacement itself. According to ABB's global survey of over 3,200 plant maintenance decision-makers, two-thirds of industrial businesses experience unplanned outages at least once a month, at a cost to the typical business of close to $125,000 per hour.



In heavy industrial sectors specifically, the numbers are higher. Mining, metals and heavy industrial companies lose an estimated 23 hours per month to machine failures, at a cost of $187,500 per hour. Unplanned downtime costs manufacturers roughly 35% more per minute than planned downtime, because it triggers emergency repairs, overtime labour, expedited parts, and cascading schedule disruption.



A component that fails unpredictably contributes to this cost in a way that a component replaced on a planned schedule does not. The ability to move from reactive to planned maintenance is one of the most significant financial arguments for materials that deliver consistent, predictable service life.



5. Secondary damage and cascading costs



Degrading components cause damage beyond their own replacement cost. A worn roller lining that begins to shed material contaminates the conveyed product. A failing seal allows process fluid to reach adjacent bearings. In some applications — subsea, food processing, pharmaceutical — the consequences of secondary contamination are severe and the remediation costs dwarf the original component cost. Polyurethane components, because they degrade more slowly and more predictably, reduce the risk of uncontrolled failure modes that trigger secondary damage events.



The TCO calculation in practice: a worked framework



In high-demand applications like steel processing or marine pipe-laying, the total cost of ownership calculation strongly favours polyurethane — often by 50–70% over a five-year operating window despite a 2–4x initial price premium. For lighter-duty applications where rubber achieves acceptable service life and replacement costs are minimal, the lower initial price may be the more practical choice. The framework, not the rule, is what matters.



How the prepolymer system chosen affects the TCO outcome



Not all cast polyurethane delivers equivalent service life. The TCO calculation is only as good as the material selection decision that underpins it. Two variables matter most: the polyol base chemistry and the isocyanate choice. These are covered in full in our article on polyether vs polyester base chemistry. How abrasion resistance is measured, and what service life data from ISO 4649 actually tells you, is explained in our Abrasion &amp; Wear Performance article. For the procurement team, the practical implication is this: specifying "polyurethane" without defining the chemistry and hardness is not a specification. It is an approximation that can produce widely varying service life outcomes.



The HYPERLAST™ and DIPRANE™ prepolymer systems from Dow cover the two primary performance envelopes in cast PU for industrial applications:



HYPERLAST™ is the specification for applications where hydrolysis resistance, dynamic performance and low-temperature flexibility are the primary service life drivers: pipe and pump linings, offshore components, seals and gaskets in wet environments, high-speed rollers where heat build-up is the failure mechanism. In these applications, a polyester-based system that fails through hydrolysis at 18 months will not deliver the TCO advantage that a correctly specified polyether system achieving 48+ months will.



DIPRANE™ is the specification for dry or controlled environments where sliding abrasion resistance, cut strength and chemical resistance dominate: mining screens, conveyor rollers, industrial wheels, scrapers. The harder, tougher elastomers produced by polyester chemistry deliver the wear performance that drives the service life extension the TCO case depends on.



Using the wrong system in either environment — a polyester grade in a sustained wet application, or a soft polyether grade on a high-abrasion dry surface — will not achieve the service life extension that justifies the unit cost premium. The TCO case requires the right chemistry, not just the right material family.





Building the internal business case



For procurement teams making the case to financial stakeholders, the TCO argument needs to be structured in terms that finance will recognise and accept. Three steps make the case robust:




Step 1: Establish the current replacement baseline. How often is the component currently being replaced? What is the unit cost? How many maintenance hours does each replacement consume? What production downtime — planned or unplanned — is associated with each replacement event? These numbers exist in maintenance records. Pulling them is the first step.



Step 2: Quantify the downtime cost. Even a conservative estimate of downtime cost transforms the calculation. An outage lasting a full eight-hour shift costs the typical industrial business close to one million dollars, based on ABB's median hourly rate of $125,000. Even at a fraction of that figure, avoiding two or three unplanned downtime events over five years transforms a unit cost premium into a clear net positive.




What procurement teams should ask during specification



When requesting quotations for cast polyurethane components — or evaluating a formulator's recommendation — these are the questions that determine whether the TCO case will hold:



What is the specified polyol base chemistry (polyether, polyester, or polycaprolactone) and why is it appropriate for this operating environment? What hardness grade is being specified, and on what basis? What service life has been demonstrated for this system in comparable applications? Is the system REACH-compliant and MbOCA-free (a regulatory requirement for European supply chains, covered in our MbOCA and REACH compliance article)? What technical documentation is available to support internal qualification and customer sign-off?



These questions cannot be answered by a rubber supplier substituting a generic PU grade. They require a distributor with formulation expertise and direct access to validated system data — which is the role Safic-Alcan plays as the authorised European distributor of Dow Polyurethanes. The full picture on European sourcing requirements — REACH documentation, shelf life management, supplier qualification and pan-European supply — is covered in the article on EU Sourcing &amp; Distribution.



Frequently asked questions



Is cast polyurethane cheaper than rubber over the long term?



In most demanding industrial wear applications, yes. Cast polyurethane typically costs 30–50% more per unit than commodity rubber, but delivers three to five times longer service life in high-wear conditions. Over a five-year operating horizon, the cumulative material cost of polyurethane is typically 40–60% lower than rubber, once replacement cycles are counted. The advantage is further amplified when maintenance labour costs and unplanned downtime associated with more frequent rubber replacements are included in the calculation.



What is total cost of ownership (TCO) in the context of industrial elastomers?



TCO for industrial elastomeric components is the sum of all costs associated with a component over a defined operating period — including acquisition cost, cumulative replacement spend across multiple cycles, maintenance labour for each replacement event, production downtime associated with replacements and failures, and any secondary damage costs caused by component degradation. Unit price alone is not a TCO proxy. In wear-intensive applications, it is typically the least informative cost metric.



How does unplanned downtime affect the TCO case for polyurethane?



Unplanned downtime is often the largest single variable in an industrial elastomer TCO calculation. According to ABB's global survey of over 3,200 plant maintenance leaders, the typical industrial business faces unplanned downtime at least once a month at a cost of approximately $125,000 per hour. A component that fails unpredictably contributes to this cost. A component with consistent, predictable service life enables planned maintenance — converting expensive unplanned events into scheduled replacement windows. Avoiding two or three unplanned downtime incidents over five years frequently justifies the entire unit cost premium for polyurethane, before any other cost category is considered.



How long does a cast polyurethane component last compared to rubber?



Service life depends heavily on the operating environment and the specific formulation. In high-wear industrial applications — mining conveyors, rollers, pipe linings, wear panels — cast polyurethane components typically achieve three to five times longer service life than rubber equivalents under comparable conditions. In steel mill roller applications, polyurethane achieves 12–36 months service life versus 3–6 months for rubber. In marine pipe-laying operations, polyurethane roller pads require approximately three to five replacement sets over five years, versus ten to twenty for rubber. These ratios vary by application; the correct formulation must be matched to the specific failure mode.



What is the difference between HYPERLAST™ and DIPRANE™ for industrial wear applications?



HYPERLAST™ prepolymers by Dow are polyether-based systems that produce elastomers with excellent hydrolysis resistance, strong dynamic performance and good low-temperature flexibility — best suited for wet, cold or dynamically demanding environments such as pipe linings, offshore components and high-speed rollers. DIPRANE™ prepolymers by Dow are polyester systems producing tough, durable elastomers with excellent sliding abrasion resistance, cut strength and chemical resistance — best suited for dry or abrasive environments such as mining screens, conveyor rollers and industrial wheels. The TCO case depends on specifying the right system for the operating environment. Both are available through Safic-Alcan across Europe.



How do I build a business case for switching from rubber to polyurethane?



Start with three steps: 




(1) establish the current replacement baseline — how often the component is replaced, what it costs, and what downtime is associated with each event; 



(2) quantify your facility's downtime cost per hour, using operational data or published industrial benchmarks; 



(3) request application-specific service life data from the prepolymer supplier for comparable installations. The combination of extended service life, avoided maintenance events, and reduced unplanned downtime typically produces a clear five-year TCO advantage that justifies the unit cost premium in demanding applications.




Does the polyurethane chemistry affect service life and TCO outcomes?



Yes, significantly. Specifying "polyurethane" without defining the base chemistry and hardness is not an adequate specification for TCO purposes. A polyester-based system in a sustained wet environment will fail through hydrolysis at a fraction of the service life a correctly specified polyether system would achieve. A soft polyether grade on a high-abrasion dry surface will not deliver the wear resistance that makes the TCO case. The correct chemistry — polyether for wet/dynamic applications, polyester/polycaprolactone for dry/abrasive applications — must be matched to the specific operating environment and dominant failure mode.



REFERENCES &nbsp;



&nbsp;ABB Value of Reliability survey: unplanned downtime costs $125,000/hour — ABB · &nbsp;



The monthly metric: unscheduled downtime — ISM World · &nbsp;



True cost of downtime: mining and heavy industry — ISA / Senseye · &nbsp;



Cost of downtime in manufacturing 2025 — Arda · &nbsp;



Cast polyurethane properties and industrial performance — All-State Industries






Use the product picker to narrow the Dow Polyurethanes range by chemistry, hardness and operating environment.

Not sure which system fits your application?

Cast polyurethane total cost of ownership: a buyer's guide


TL;DR: MbOCA (4,4'-methylene-bis(2-chloroaniline)) has been subject to EU REACH authorisation requirements since 2017. Any European processor still using it without a current, valid authorisation is operating outside the law — and authorisations are time-limited and increasingly difficult to obtain. Several REACH-compliant alternatives are now available, including MDI-based multi-component systems such as HYPERLAST™ 153 series by Dow. Transition support is available. The question is no longer whether to move — it is how.



For decades, MbOCA was the curative of choice for TDI-based cast polyurethane elastomers. First used in the 1950s, it became the dominant chain extender for TDI/PTMEG prepolymer systems across a wide range of industrial applications — mining equipment, rollers, wheels, seals, offshore components. The combination delivered reliable, high-performance elastomers that were easy to process and relatively tolerant of variation in casting conditions.



That era ended at the regulatory level in 2017, and MbOCA REACH compliance has been a live obligation for European processors ever since. Under the EU's REACH Regulation, MbOCA was placed on the Annex XIV Authorisation List as a substance of very high concern, with a sunset date of November 2017. Since then, its use in Europe without a granted authorisation has been prohibited. For processors who have not yet completed the transition, the regulatory, supply chain and commercial risk is real — and increasing.



This article explains the regulatory position clearly, what MbOCA actually is and why it was restricted, what reformulation involves in practice, and how the HYPERLAST™ &amp; Diprane ranges from Dow provide a technically validated compliance route. For a broader overview of HYPERLAST™ and DIPRANE™ chemistry and applications, see our article on high performance elastomers. For the base chemistry context behind TDI/MbOCA and MDI systems, see our Polyether vs Polyester article.



What MbOCA is and why it was restricted



MbOCA — also written MOCA or MBOCA, formally 4,4'-methylene-bis(2-chloroaniline), CAS number 101-14-4 — is an aromatic diamine curative. When mixed with a TDI prepolymer, it reacts with the free isocyanate groups to crosslink the polymer chains, producing the hard segments that give cast polyurethane its mechanical strength. Estimates for MbOCA consumption in the European cast PU industry ranged from 4,500 to 8,000 metric tonnes annually at the time of the regulatory review.



The restriction derives from its toxicological profile. MbOCA is structurally similar to benzidine, a known human bladder carcinogen, and has been shown in animal studies to cause tumours of the liver, lung, urinary bladder and mammary glands. It is classified as a proven human carcinogen on the WHO/IARC Group 1 list, with a workplace threshold limit value of 0.01 ppm. ECHA identified MbOCA as a substance of very high concern (SVHC) and included it on the Candidate List for authorisation, before progressing it to Annex XIV.



For processors, the principal occupational exposure route is skin absorption during the casting and mould trimming operations — not inhalation. This made exposure control through engineering measures difficult to guarantee consistently across production environments, which contributed to the regulatory decision to require authorisation rather than simply set tighter workplace limits.



MbOCA REACH compliance: what the regulatory position means in practice



Under REACH Regulation (EC) No 1907/2006, Annex XIV lists substances that cannot be placed on the EU market or used after their sunset date unless a company has applied for and received a formal authorisation from the European Commission. MbOCA's sunset date was set at 22 November 2017.




2011: MbOCA added to ECHA Candidate List as a substance of very high concern (SVHC).



2013: MbOCA included in REACH Annex XIV Authorisation List.



May 2016: Latest application date — processors using ≥ 1 tonne/year had to have submitted an authorisation application to continue use after the sunset date.



Nov 2017: Sunset date. Use of MbOCA in the EU without a granted authorisation becomes illegal.



2017–present: A limited number of processors obtained time-limited authorisations for specific uses. These are subject to review and may not be renewed indefinitely. Processors without authorisation who are still using MbOCA are operating outside REACH.




Authorisation is not the same as compliance. Even processors who obtained a REACH authorisation in 2017 operate under a time-limited, use-specific permission that must be reviewed before it expires. An authorisation granted for one application does not cover a new or modified use. The correct long-term compliance position is reformulation to an MbOCA-free system.



ECHA's own substitution plan analysis found that, prior to the sunset date, many processors had already tested alternative systems including MDI/BDO, MDI/MCDEA and TDI. The transition is technically achievable — but it is not trivial, and it requires support from a prepolymer supplier with validated systems and formulation expertise.



Why MbOCA is hard to replace — and why processor inertia is understandable



Understanding why so many processors remained on MbOCA well past the regulatory pressure requires acknowledging the real technical challenges involved in replacing it.



Industry experts have confirmed that no perfect drop-in replacement for MbOCA exists in TDI-based systems. Its combination of properties was genuinely difficult to match: long pot life, wide processing latitude, tolerance of ratio variation, and the ability to produce consistently high-quality parts across a wide hardness range. Alternative curative systems with TDI prepolymers were tested extensively by many processors, but many did not meet hardness requirements, had unacceptably short pot life, or failed dynamic test evaluations.



The leading diamine alternatives for TDI systems are DMTDA (dimethylthiotoluenediamine) and MCDEA (4,4'-methylenebis(3-chloro-2,6-diethylaniline)). DMTDA offers processing characteristics that are reasonably close to MbOCA and has been successfully adopted by a number of processors, particularly in applications where pot life management and formulation flexibility are priorities. As with any curative transition, specific formulation parameters require validation for each application and process setup. MCDEA offers good dynamic properties and abrasion resistance but exhibits higher reactivity than MbOCA — producing shorter pot lives with TDI prepolymers — and requires careful temperature management around its 87–90°C melting point.



Both routes are technically viable and in active industrial use. The right choice depends on the processor's existing equipment, target applications, and supply chain context.



The second route is a move away from TDI altogether. The shift from TDI/MbOCA to MDI requires investment in adapted equipment and process adjustment, since MDI formulations are more sensitive to moisture and require greater precision in ratio control. But MDI-based systems paired with diol curatives such as BDO (1,4-butanediol) or HQEE produce REACH-compliant elastomers with properties that match or exceed TDI/MbOCA performance across a wide range of applications.



The HYPERLAST™ 153 series: the validated compliance route



Dow developed the HYPERLAST™ 153 series specifically to address the MbOCA transition for European cast PU processors. The system does not contain a mercury catalyst, does not require MbOCA as a curative, and is REACH-compliant.



Key technical characteristics of the HYPERLAST™ 153 series:




Hardness range: 55 Shore A to 75 Shore D with a four-component system — covering the full application range previously served by TDI/MbOCA formulations.



Processing temperatures: System components are processed at lower temperatures than full prepolymer countertypes, enabling energy savings in production.



Processing control: Designed to give processors control over pot life and demould time, with flexibility for both small and large part production.



Proven applications: Validated in demanding applications including dynamic offshore bend stiffeners, pipeline scrapers, mining screens, timing belts, rollers and tooling components.



No mercury catalyst: The system removes organo-mercury compounds — historically used to catalyse MDI/polyol reactions — addressing an additional regulatory risk under REACH.




The broader HYPERLAST™ and DIPRANE™ ranges from Dow include additional MDI-based systems validated for MbOCA-free operation. MDI-based technologies within the HYPERLAST and DIPRANE ranges have demonstrated wear resistance equal to or better than TDI/MbOCA in demanding applications such as pipeline scrapers and mining screens.







What the reformulation process involves



Transitioning from TDI/MbOCA to an MDI-based system is a formulation project, not a simple curative swap. The degree of process change required depends on the current casting setup and the parts being produced, but three areas consistently require attention:



Equipment and process temperature management. &nbsp;



MDI-based systems require more precise temperature control than TDI/MbOCA. Raw material temperatures, mold temperatures and mix ratios all need validation. For processors running manual casting, this typically means tighter operating procedures; for machine-casting operations, it may require calibration or equipment adjustment.



Ratio precision. &nbsp;



MDI/diol systems require tighter stoichiometric control than TDI/MbOCA. Where TDI/MbOCA tolerates a ±3% variation in curative ratio without significant effect on part quality, MDI systems are more sensitive. Processors transitioning from manual to machine-assisted dispensing often see this as an opportunity to improve consistency alongside compliance.



Part validation and customer sign-off. Many industrial components are specified with reference to a particular curative system — sometimes explicitly on part drawings. A reformulation requires re-qualification testing and, in some cases, customer acceptance of the new chemistry. This is a supply chain management exercise as much as a technical one, and Safic-Alcan's polyurethane technical team can support both the testing and the documentation required. For the TCO case that makes the reformulation investment worthwhile, see the our article on TCO &amp; Material ROI. For REACH documentation and sourcing requirements in Europe, see the article on EU Sourcing &amp; Distribution.



The supply chain risk of remaining on MbOCA



Beyond the legal position, processors who have obtained authorisations and are still running TDI/MbOCA face a structural supply chain risk that goes beyond regulatory compliance. As the number of authorised users in Europe decreases, supply availability for MbOCA narrows. Suppliers reducing production volumes introduce minimum order requirements or price volatility. A processor dependent on MbOCA availability is exposed to a supply disruption risk that is not present for processors running fully available, non-restricted MDI-based alternatives.



The transition, while requiring upfront investment in validation, eliminates this ongoing exposure entirely — while also removing the administrative burden of authorisation renewals, annual employee exposure monitoring, and the associated documentation requirements under REACH.





Frequently asked questions



What is&nbsp;MbOCA&nbsp;and why is it being phased out in&nbsp;Europe?&nbsp;



MbOCA&nbsp;(4,4'-methylene-bis(2-chloroaniline), also known as MOCA or MBOCA)&nbsp;is&nbsp;an aromatic diamine curative widely used for decades in TDI-based cast polyurethane elastomers. It was placed on the EU REACH Annex XIV&nbsp;Authorisation&nbsp;List because it is classified as a proven human carcinogen — structurally related to benzidine and shown in multiple animal studies to cause&nbsp;tumours&nbsp;of the liver, lung,&nbsp;bladder&nbsp;and mammary glands. Its sunset date under REACH was 22 November 2017, after which its use in Europe without a specific granted&nbsp;authorisation&nbsp;is prohibited.&nbsp;



Is&nbsp;MbOCA&nbsp;banned in&nbsp;Europe?&nbsp;



MbOCA&nbsp;is not an outright ban in the sense of a complete prohibition — it is subject to the EU REACH&nbsp;authorisation&nbsp;regime under Annex XIV. This means it cannot be used after its 2017 sunset date unless a company has applied for and received a specific&nbsp;authorisation&nbsp;from the European Commission for each use.&nbsp;Authorisations&nbsp;are time-limited, use-specific, and subject to review. In practice, obtaining and&nbsp;maintaining&nbsp;authorisation&nbsp;is increasingly difficult, and the recommended long-term position is reformulation to a REACH-compliant alternative.&nbsp;



What&nbsp;are&nbsp;the REACH-compliant alternatives to&nbsp;MbOCA&nbsp;in cast&nbsp;polyurethane?&nbsp;



Two main compliance routes exist: switching to MDI-based prepolymer systems cured with diol chain extenders such as BDO or&nbsp;HQEE, or&nbsp;using alternative aromatic diamine curatives within TDI-based systems, primarily&nbsp;DMTDA&nbsp; or&nbsp;MCDEA — both of which are in active industrial use as REACH-compliant chain extenders.&nbsp;The HYPERLAST™ 153 series by Dow provides a validated, REACH-compliant MDI-based multi-component&nbsp;system covering a hardness range from 55 Shore A to 75 Shore D, available through&nbsp;Safic-Alcan across Europe.&nbsp;



What is the HYPERLAST™ 153 series and how does it replace&nbsp;MbOCA?&nbsp;



HYPERLAST™ 153 is a polyether-based, MDI multi-component&nbsp;polyurethane elastomer system developed by Dow specifically to enable European processors to reformulate away from&nbsp;MbOCA. It&nbsp;contains&nbsp;no mercury catalyst and requires no&nbsp;MbOCA&nbsp;curative. The four-component system produces tough, durable elastomers from 55 Shore A to 75 Shore D, is processed at lower temperatures than full prepolymer equivalents (allowing energy savings), and&nbsp;gives processors control over pot life and&nbsp;demould&nbsp;time. It has been&nbsp;validated&nbsp;in demanding applications including offshore bend stiffeners, pipeline scrapers, mining&nbsp;screens&nbsp;and industrial rollers. It is available through&nbsp;Safic-Alcan across Europe.&nbsp;



What is the REACH Annex XIV&nbsp;Authorisation&nbsp;List?&nbsp;



REACH&nbsp;Annex XIV — the&nbsp;Authorisation&nbsp;List — is the list of substances of very high concern (SVHCs) that cannot be placed on the EU market or used after their specified sunset date, unless a company has applied for and received a formal&nbsp;authorisation&nbsp;from the European Commission for each specific use.&nbsp;Authorisations&nbsp;are granted for a review period (typically four to seven years) and are not automatically renewed.&nbsp;MbOCA&nbsp;is included on Annex XIV with a sunset date of November 2017.&nbsp;



Does switching from TDI/MbOCA&nbsp;to an MDI system affect part&nbsp;performance?&nbsp;



In&nbsp;most applications, MDI-based systems&nbsp;validated&nbsp;for&nbsp;MbOCA&nbsp;substitution deliver equivalent or better performance than TDI/MbOCA&nbsp;formulations. Dow's data on HYPERLAST™ and DIPRANE™ MDI-based systems shows wear resistance equal to or better than TDI/MbOCA&nbsp;in demanding applications such as pipeline scrapers and mining screens. The transition does require process adaptation — MDI systems need tighter ratio control and temperature management — but with proper formulation support and trial validation, parts consistently meeting original specifications are achievable.&nbsp;



Where can I get technical support for&nbsp;MbOCA&nbsp;reformulation in&nbsp;Europe?&nbsp;



Safic-Alcan, as the&nbsp;authorised&nbsp;European distributor of Dow Polyurethanes,&nbsp;provides&nbsp;formulation guidance, sample&nbsp;supply&nbsp;and full REACH documentation support for the HYPERLAST™ 153 and broader Dow PU range across France, UK, Benelux, DACH, the Nordics, Spain,&nbsp;Portugal&nbsp;and&nbsp;most CEE countries. Contact the local&nbsp;Safic-Alcan technical team for a reformulation assessment.&nbsp;



What is an SVHC under REACH?&nbsp;



A substance of&nbsp;very high&nbsp;concern (SVHC) is a chemical&nbsp;identified&nbsp;by ECHA as posing serious risks to human health or the environment — typically because it is carcinogenic,&nbsp;mutagenic&nbsp;or toxic to reproduction (CMR), persistent and bioaccumulative, or of equivalent concern. SVHCs are first added to the REACH Candidate List, which triggers notification and communication obligations in supply chains. The most critical SVHCs may be progressively included in the Annex XIV&nbsp;Authorisation&nbsp;List, limiting their use after a sunset date unless&nbsp;authorisation&nbsp;is granted.&nbsp;&nbsp;



&nbsp;REFERENCES&nbsp;&nbsp;



MbOCA substance information — ECHA&nbsp;



REACH Annex XIV Authorisation List — ECHA&nbsp;



Understanding REACH — ECHA&nbsp;&nbsp;



Polyurethane makers prepare for MbOCA phase-out — C&amp;EN / ACS&nbsp;·&nbsp;EU MbOCA sunset: industry report — Urethanes Technology International&nbsp;·&nbsp;&nbsp;



Dow launches HYPERLAST™ 153 — Interplas Insights&nbsp;·&nbsp;&nbsp;



Dow HYPERLAST™ 153 range — Urethanes Technology International&nbsp;·&nbsp;&nbsp;



MbOCA-free Dow elastomers for REACH compliance — FAPU&nbsp;·&nbsp;



ECHA substitution plan — MbOCA alternatives analysis&nbsp;·&nbsp;&nbsp;






Our online catalog narrows HYPERLAST and DIPRANE grades by operating environment, hardness and failure mode

Choosing a cast PU system?

Going MbOCA-free: the REACH compliance roadmap for European cast PU processors


TL;DR :The choice between polyether and polyester polyol base chemistry is the single most consequential formulation decision for a cast polyurethane component. It determines a cluster of downstream performance properties — hydrolysis resistance, dynamic behaviour, low-temperature flexibility, chemical resistance, abrasion mode — that no curative or additive adjustment can fully compensate for. Getting it right at the prepolymer selection stage is what separates a component that meets its service life target from one that fails ahead of schedule.



Every cast polyurethane elastomer starts from the same basic architecture: a polyol, an isocyanate, and a curative. But beneath that common structure, the choice of polyol base chemistry — polyether or polyester — drives a fundamental divergence in how the cured elastomer will behave in service. The two chemistries have different molecular backbones, different responses to moisture and temperature, and different mechanical profiles. In the right application, each outperforms the other. In the wrong one, either can fail.



For formulators specifying a prepolymer system, and for procurement teams trying to understand why a particular grade is being recommended, this guide covers the decision in full. It explains the chemistry, the performance consequences, how the isocyanate choice interacts with the polyol selection, and how the HYPERLAST™ and DIPRANE™ prepolymer families by Dow map to each requirement.



For a broader decision framework covering abrasion testing, TCO and sourcing considerations, see our article on high-performance elastomers in demanding environments. For a detailed treatment of abrasion testing methodology and how wear performance data translates to real service life,see our piece on abrasion and wear performance in polyurethane elastomers.



What makes the polyol choice so consequential



In a cast polyurethane elastomer, the polyol forms the soft segment of the polymer network — the flexible part of the chain between the hard segments created by isocyanate and curative. The soft segment determines the elastomer's response to environmental stress: how it behaves in water, under cold, under cyclic load, and in contact with chemicals.



The choice of polyol is what defines the bulk of a cast PU elastomer's long-term performance characteristics. Mechanical adjustments made through curative selection, stoichiometry, or processing conditions operate within the envelope the polyol chemistry creates. They cannot move the elastomer to a fundamentally different performance regime.



The two main polyol families used in industrial cast polyurethane prepolymers are:



Polyether polyols. The backbone contains ether linkages (–C–O–C–).The two used most widely in industrial cast systems are:




PTMEG (polytetramethylene ether glycol), also called PTMG or polytetrahydrofuran, which delivers the highest resilience and the best dynamic performance.





PPG (polypropylene glycol), a lower-cost polyether offering good hydrolysis resistance with more modest mechanical properties.




Polyester polyols, including adipate polyesters and polycaprolactone (PCL). The backbone contains ester linkages (–COO–).



These two backbone structures respond very differently to water, temperature, and mechanical stress — which is where the performance split begins.







Polyether-based systems: where to use them



Hydrolysis resistance — the decisive advantage



The most important property of polyether-based cast polyurethane is its resistance to hydrolysis — degradation by water or moisture. The ether linkage in the polymer backbone is chemically stable in the presence of water, even at elevated temperatures. Polyether polyurethanes can remain stable in water as warm as 50°C for long periods and are recommended wherever high humidity or water exposure is a concern.



In quantitative terms, polyether systems substantially outperform polyester formulations in sustained wet conditions, with hydrolysis half-life data showing polyether-based systems retaining mechanical properties far longer under immersion at elevated temperatures. Temperature is a critical modifier: at 90°C water, degradation accelerates sharply for both systems, but polyether materials retain properties significantly longer than polyester equivalents.



For applications in wet, humid, offshore or submerged environments — pipe and pump linings, offshore bend stiffeners, hydrocyclones, subsea protection components — polyether chemistry is the baseline requirement, not an optional upgrade.



Dynamic performance and low-temperature flexibility



PTMEG-based polyether systems deliver a combination of high resilience and low heat build-up under cyclic loading that polyester systems cannot match. PTMEG polyether materials offer excellent low-temperature flexibility and excellent dynamic properties, with resistance to microbial attack and hydrolysis. This makes them the preferred specification for high-speed rollers, dynamic seals, and any component where cyclic deformation generates internal heat.



Polyether urethanes are much less susceptible to dynamic heat build-up — that is precisely why they are the choice for high-speed rollers where rapid flexing creates heat. A polyester-based system in the same application will accumulate heat faster, accelerating degradation and ultimately reducing service life. The final decision lies in the failure mode : if the wear is the most important one, a polyester can be the right choice.



At sub-zero temperatures, polyether systems also maintain flexibility where polyester grades may begin to harden. This matters for components operating in cold storage environments, in winter outdoor conditions, or in refrigerated industrial processes.



The HYPERLAST™ range



The HYPERLAST™ range by Dow is built exclusively on polyether polyols. HYPERLAST systems produce elastomers with strong dynamic performance, resilience, hydrolysis resistance and performance at low temperatures — making them suitable for high-speed and high-load-bearing applications in cold or wet environments.



The range includes the HYPERLAST™ 153 series, developed to enable REACH-compliant reformulation away from MbOCA-cured systems — an important consideration for European processors. This is covered in full in the dedicated MbOCA/REACH Compliance article. HYPERLAST™ systems are available through Safic-Alcan across Europe, for processors seeking to minimise sensitisation risk.



Chemical resistance



Polyester polyurethanes are more resistant to oils, fuels, and chemical solvents than polyether equivalents. The ester backbone interacts more favourably with non-polar organic compounds, making polyester and polycaprolactone-based systems the preferred specification for components in direct contact with lubricants, hydraulic fluids, or hydrocarbon-based process chemicals.



The DIPRANE™ prepolymer range



The DIPRANE™ range by Dow is built on polyester polyols . DIPRANE prepolymers produce tough, durable elastomers with excellent resistance to wear and tear, cuts, flex fatigue and organic chemicals — ideal for wheels, rollers and mining equipment including screens, scrapers and conveyors. The range covers both TDI and MDI variants, enabling formulators to match the specific hardness range and processing requirements of each application.



DIPRANE™ systems can be formulated to achieve excellent solvent resistance and are available in grades spanning soft Shore A through to hard Shore D — making them highly versatile across the dry and chemically demanding application space.



The isocyanate dimension: TDI vs MDI



The polyol choice sets the environmental performance envelope. The isocyanate choice — TDI (toluene diisocyanate) or MDI (methylene diphenyl diisocyanate) — shapes the mechanical and processing profile within that envelope. The two choices interact, so it is worth understanding what each brings.



TDI: lower viscosity, better dynamic performance, longer pot life



TDI produces lower-viscosity prepolymers than MDI — a direct processing advantage for manual or semi-automated casting operations, particularly at lower temperatures. TDI-based systems offer excellent dynamic properties and low-temperature flexibility, and their longer pot life gives processors more working time before viscosity build prevents clean mold fill.



MDI: higher hardness potential, better thermal stability



MDI-based systems offer the path to higher hardness levels and better performance at elevated temperatures. MDI prepolymers combine easy processing with good flowability and are available in both ether and ester series.



The trade-off is a shorter pot life and, for pure 4,4'-MDI, a higher melting point that requires more careful temperature management in processing. Modified MDI variants with higher 2,4'-content exhibit lower melting points, slower reaction rates and better processing characteristics — an important consideration for formulators moving from TDI to MDI systems.



Hyperlast &amp; Diprane™ quasi-prepolymers



Some applications impose combinations of requirements that sit between the polyether and polyester performance envelopes. Hyperlast &amp; Diprane quasi-prepolymer systems from Dow extend the available formulation range beyond what standard prepolymers of either chemistry can achieve. They enable intermediate property profiles — higher NCO content, greater formulation flexibility — for applications where the standard polyether vs polyester decision does not resolve cleanly. 



VORASTAR™ systems are particularly useful for processors who need to tune specific property combinations — hardness, resilience, chemical resistance — beyond the range achievable with full prepolymers alone.







Making the formulation decision: the four-variable framework



In practice, base chemistry selection comes down to a structured assessment of four variables:



1. Primary performance requirement. Is the dominant failure mode abrasion, hydrolysis, dynamic fatigue, or chemical attack? Abrasion in dry conditions points to polyester. Hydrolysis or dynamic load points to polyether. Chemical exposure points to polyester or PCL.



2. Operating environment. Is the component wet, humid, submerged, or cold? These conditions strongly favour polyether. Dry, chemically exposed, or high-temperature environments favour polyester.



3. Hardness range required. Both polyether and polyester systems can be formulated across the full range, from soft Shore A to hard Shore D, so hardness alone rarely decides the base chemistry. It does influence the isocyanate choice: MDI-based systems reach the hardest grades more easily and hold their properties better at elevated temperature, while TDI-based systems are usually specified where dynamic performance and processing latitude matter more than peak hardness.



4. Processing conditions. What is the available pot life? Is the casting manual or machine-dispensed? TDI-based systems offer longer pot life and lower viscosity for more demanding casting operations. MDI systems require tighter temperature management but can deliver properties TDI cannot reach.





Frequently asked questions



What is the difference between polyether and polyester polyurethane?



Polyether polyurethanes are built on a polyol backbone containing ether linkages (–C–O–C–), which delivers outstanding hydrolysis resistance, excellent low-temperature flexibility and strong dynamic performance. Polyester polyurethanes use a polyol backbone with ester linkages (–COO–), which delivers higher tensile and tear strength, better sliding abrasion resistance in dry environments, and superior resistance to oils and organic chemicals. The choice between them depends on the primary performance requirement and operating environment.



Which polyurethane is better for wet or submerged applications: polyether or polyester?



Polyether-based polyurethane is significantly better for wet, humid or submerged applications. The ether backbone is chemically stable in the presence of water, maintaining mechanical properties over long periods of moisture exposure. Polyester-based systems are susceptible to hydrolytic cleavage of their ester bonds, which progressively degrades mechanical properties in sustained wet conditions. For offshore, subsea, water treatment or high-humidity industrial applications, polyether systems are the standard specification.



What is HYPERLAST™ and when should it be used?



HYPERLAST™ is a range of polyether polyurethane prepolymer systems manufactured by Dow Polyurethanes. It produces cast elastomers with excellent hydrolysis resistance, strong dynamic performance, high resilience and good low-temperature flexibility. HYPERLAST™ is the preferred specification for high-speed, high-load-bearing industrial applications in wet or cold environments — including rollers, offshore bend stiffeners, pipe linings, hydrocyclones and dynamic seals. It is available through Safic-Alcan across Europe.



What is DIPRANE™ and when should it be used?



DIPRANE™ is a range of polyester polyurethane prepolymer systems by Dow. It produces tough, durable elastomers with excellent sliding abrasion resistance, high tensile and tear strength, and strong resistance to oils and organic chemicals. DIPRANE™ is the preferred specification for dry or chemically exposed industrial applications — including mining screens, conveyor rollers, industrial wheels and scrapers. It is available through Safic-Alcan across Europe.



What is the difference between TDI and MDI in cast polyurethane?



TDI (toluene diisocyanate) produces lower-viscosity prepolymers with longer pot life and excellent dynamic and low-temperature performance — preferred for dynamic load applications and manual or semi-automated casting. MDI (methylene diphenyl diisocyanate) offers higher hardness potential, better thermal stability and is preferred for very hard Shore D grades or elevated temperature applications. &nbsp;



Where can I buy HYPERLAST™ and DIPRANE™ prepolymers in Europe?



Safic-Alcan is the authorised European distributor of the complete Dow Polyurethanes range — including HYPERLAST™, DIPRANE™, VORASTAR™ and DURAMOULD™ — across France, the UK, Benelux, the Nordics, DACH (Germany, Austria, Switzerland), Spain, Italy, Portugal and most CEE countries. Contact the local Safic-Alcan technical team for data sheets, samples and formulation guidance.



Is polyether polyurethane better than polyester polyurethane?



Neither is better overall. Polyether wins in wet and dynamic conditions; polyester wins on cut, tear, abrasion and oil resistance.



REFERENCES



Polyester vs polyether polyurethane — Gallagher Corp · &nbsp;



Beginner's guide to polyurethane — Gallagher Corp · &nbsp;



Polyurethane elastomer hydrolytic stability — Anderson Development Company · &nbsp;



Polyester vs polyether TPU — Geosynthetics Magazine &nbsp;



MDI vs TDI — ScienceDirect Topics · &nbsp;



Dow HYPERLAST™ and DIPRANE™ product line — WebWire


See Dow HYPERLAST and DIPRANE prepolymers, download TDS and request samples.

Choosing a cast PU system? 

Polyether vs polyester polyurethane: how base chemistry determines performance in harsh environments


Key&nbsp;takeaway:&nbsp;A&nbsp;material's&nbsp;abrasion&nbsp;resistance&nbsp;figure —&nbsp;expressed&nbsp;as volume&nbsp;loss&nbsp;under&nbsp;ISO 4649 / DIN 53516 — tells&nbsp;you&nbsp;how fast a&nbsp;component&nbsp;will&nbsp;wear down, but&nbsp;only&nbsp;under&nbsp;controlled&nbsp;conditions.&nbsp;Understanding&nbsp;what&nbsp;the data&nbsp;actually&nbsp;measures, and how base&nbsp;chemistry&nbsp;drives wear performance in real&nbsp;environments,&nbsp;is&nbsp;what&nbsp;separates&nbsp;a&nbsp;well-specified&nbsp;component&nbsp;from&nbsp;one&nbsp;that&nbsp;fails&nbsp;ahead&nbsp;of&nbsp;schedule.&nbsp;



When an industrial component fails because of wear, the cost is rarely the replacement part alone. It is the unplanned downtime, the maintenance labour, and the disruption to production schedules. For engineers and procurement teams specifying elastomeric components — rollers, conveyor linings, seals, screen panels, wear protection layers — abrasion resistance is not a secondary specification detail. It is the variable that determines how often the failure cycle repeats.



Cast&nbsp;polyurethane&nbsp;elastomers&nbsp;are&nbsp;now&nbsp;the&nbsp;material&nbsp;of&nbsp;choice&nbsp;across&nbsp;a&nbsp;growing&nbsp;range of wear-intensive&nbsp;industrial&nbsp;applications. But&nbsp;choosing&nbsp;the right&nbsp;prepolymer&nbsp;system&nbsp;requires&nbsp;more&nbsp;than&nbsp;selecting&nbsp;the&nbsp;product&nbsp;with&nbsp;the best-looking&nbsp;number&nbsp;on a datasheet. It&nbsp;requires&nbsp;understanding&nbsp;what&nbsp;abrasion test data&nbsp;actually&nbsp;measures,&nbsp;which&nbsp;base&nbsp;chemistry&nbsp;drives performance&nbsp;under&nbsp;which&nbsp;conditions, and how to match&nbsp;material&nbsp;selection&nbsp;to the&nbsp;specific&nbsp;failure&nbsp;mode&nbsp;you&nbsp;are&nbsp;trying&nbsp;to&nbsp;prevent.&nbsp;



This article covers that decision framework. For a full comparison of cast PU prepolymer systems — including hardness selector, REACH compliance checklist and application-by-application recommendations — see our guide to selecting high-performance elastomers for demanding environments. The base chemistry decision behind each system is covered separately, in our comparison of polyether and polyester base chemistry.



How abrasion&nbsp;resistance&nbsp;is&nbsp;measured&nbsp;



The standard method for quantifying abrasion resistance in rubber and elastomers is the rotary drum abrasion test, defined today under ISO 4649 — which superseded the widely-referenced DIN 53516 standard. Both methods work on the same principle: a cylindrical specimen (16 mm diameter) is pressed against a rotating drum covered with standardised abrasive paper under a 10 N load, and traverses a total path of 40 metres. The result is expressed as volume loss in cubic millimeters. The lower the number, the better the wear resistance.



This method provides reliable comparative data for material selection and quality control. However, it does not directly predict field service life — because real components face combinations of stress (temperature, chemical exposure, dynamic load, impact) that laboratory testing does not fully replicate. A material that performs well in an ISO 4649 test will not necessarily outperform another in every application. Context matters.



A secondary metric worth understanding alongside volume loss is rebound resilience — the ratio of energy returned during elastic recovery to energy absorbed during deformation. High resilience values (60–80%) indicate low hysteresis and minimal heat build-up under dynamic cycling — critical for high-speed rollers, where heat accumulation is itself a failure mechanism. A material with excellent ISO 4649 results but poor resilience may still overheat and degrade rapidly under dynamic load.



Why cast polyurethane outperforms rubber in abrasion-intensive applications



The performance advantage of cast polyurethane elastomers over conventional rubber compounds in abrasive environments is well documented. Independent testing consistently shows polyurethane elastomers resisting abrasive wear 3 to 10 times better than conventional rubber compounds. In conveyor skirting applications within mining operations, service lives of 10 to 15 times those of rubber equivalents have been recorded.



The reason lies in the chemistry. Unlike rubber, where compounding adjustments offer limited performance range, cast polyurethane can be engineered at the molecular level — by selecting the polyol base, the isocyanate, and the curative — to optimise specifically for the dominant failure mode. The result is a material that can be hard where hardness is needed, resilient where resilience matters, and chemically stable where chemical exposure is the threat.



Polyurethane rollers, for example, on average last up to four times longer than rubber equivalents in continuous operation — sometimes exceeding 4,000 hours before requiring replacement. For procurement teams calculating total cost of ownership, the higher unit cost of a cast PU component is routinely offset by fewer replacements and reduced maintenance intervals.







Base chemistry and abrasion: the polyester vs polyether distinction



Polyester-based systems — and those built on polycaprolactone, a closely related chemistry — consistently deliver the highest scores in abrasion resistance tests under dry or controlled conditions. In three-body abrasion testing, polyester-based polyurethane approaches the wear resistance of D2 tool steel while weighing a fraction as much. Combined with superior cut and tear resistance, these systems are the preferred specification for the most abrasion-intensive industrial applications: mining equipment, wheels, conveyor rollers, screening panels, and scrapers operating in dry environments.



The DIPRANE™ prepolymer range by Dow is built on this chemistry. DIPRANE™ systems produce tough, durable elastomers with excellent resistance to wear and tear, cuts, flex fatigue and organic chemicals. They cover a wide hardness range — from soft Shore A grades suitable for impact absorption to hard Shore D grades for maximum load-bearing — and can be formulated to achieve excellent solvent resistance where chemical exposure is also a concern.



Polyether-based systems



Polyether-based systems trade some dry abrasion performance for a set of properties that matter enormously in wet, cold or dynamically demanding environments: outstanding hydrolysis resistance, excellent low-temperature flexibility, and strong dynamic resilience. In applications combining abrasion with sustained moisture exposure — pipe and pump linings, offshore components, subsea wear protection, hydrocyclones — polyether formulations typically outperform polyester grades whose hydrolytic stability limits their service life in wet conditions.



The HYPERLAST™ prepolymer range by Dow is built predominantly on polyether polyols combined with TDI. HYPERLAST systems produce elastomers with strong dynamic performance, resilience, hydrolysis resistance and performance at low temperatures — making them the preferred specification for high-speed, high-load-bearing applications in cold or wet environments. &nbsp;



What the data does not tell you: translating lab results to field conditions



The ISO 4649 test is a standardised controlled environment — a single abrasive surface, a fixed load, a fixed distance. Real industrial components operate under more complex conditions simultaneously. Three practical points follow from this:




Hardness interacts with abrasion resistance in application-specific ways. Harder formulations generally score better on ISO 4649 under low-impact, sliding contact conditions. But in impact-abrasion environments — where particles strike the surface at speed before sliding — softer, more resilient grades can outperform harder ones by absorbing impact energy rather than allowing it to initiate surface crack propagation. Shore 90A polyether polyurethane, for example, achieves 70-80 KN/m &nbsp;tear strength — significantly above natural rubber — which matters when particles are both impacting and sliding.



Dynamic loading changes the picture. &nbsp;Low compression set, combined with high resilience, is what allows a component to maintain its geometry under sustained cyclic load — which directly affects its abrasion behaviour over time.



Chemical exposure can accelerate wear independently. A polyester-based system that performs excellently in a dry abrasion test may degrade significantly faster than a polyether equivalent when the operating environment also involves sustained moisture or mild chemical exposure — not because its abrasion resistance is lower, but because hydrolytic degradation of the polymer matrix softens the material surface and increases actual wear rate in service.




Matching the right system to the application: a practical matrix







This matrix covers the most common industrial scenarios, but the optimal selection always depends on the specific combination of hardness range required, processing conditions available (pot life, casting temperature, cure cycle), and regulatory obligations. Refer to the downloadable &nbsp;selection guide for a structured decision matrix, or contact the Safic-Alcan polyurethane team for direct formulation guidance. For the procurement and TCO case behind material selection, see tour TCO &amp; Material ROI article. For sourcing and supply chain considerations in Europe, see the EU Sourcing &amp; Distribution article.



A note on regulatory compliance in wear-resistant PU formulations



European formulators working with cast polyurethane must now navigate the EU restriction on MbOCA (4,4'-methylene-bis(2-chloroaniline)) under REACH Regulation (EC) No 1907/2006. MbOCA was a widely used aromatic amine curative in cast PU systems and its classification as a substance of very high concern (SVHC) creates both regulatory and supply chain risk for processors who have not yet transitioned.



The HYPERLAST™ 153 series was developed specifically to address this transition — enabling processors to achieve tough, durable elastomers across a wide hardness range (55 Shore A to 75 Shore D) using REACH-compliant curative chemistry, without MbOCA. The full compliance and transition framework is covered in the dedicated MbOCA/REACH Compliance article.





Tear resistance: the second half of wear performance



Abrasion is only half of wear. In screens, scrapers, rollers and chute liners, parts also fail by cutting and tearing when sharp material hits the surface. Cast polyurethane combines low abrasion loss with high tear strength, which is why it outlasts rubber in these applications.



Polyester-based systems usually give the best cut and tear resistance; polyether-based systems are preferred when the part works wet or needs high resilience.



Frequently asked questions



How is abrasion resistance measured in elastomers?



Abrasion resistance in elastomers is measured using the ISO 4649 rotary drum test (which superseded DIN 53516). A cylindrical specimen is pressed against a rotating abrasive drum under a 10 N load for a distance of 40 metres. The result is reported as volume loss in cubic millimetres — lower values indicate better wear resistance. The method provides reliable comparative data between materials but does not directly predict field service life.



Is polyurethane more abrasion resistant than rubber? 



Yes, in most industrial wear conditions. Independent testing consistently shows cast polyurethane elastomers resisting abrasive wear 3 to 10 times better than conventional rubber compounds. This advantage comes from the molecular-level engineering possible with polyurethane chemistry — polyol selection, isocyanate choice, and curative type all directly influence the abrasion performance of the final elastomer.



Which polyurethane chemistry has the best abrasion resistance: polyester or polyether? 



For dry or controlled environments with sliding abrasion as the primary failure mode, polyester and polycaprolactone-based systems (such as DIPRANE™ by Dow) deliver the highest abrasion resistance. For wet, cold or dynamically demanding environments where hydrolysis resistance and resilience also matter, polyether-based systems (such as HYPERLAST™ by Dow) offer a better balance of wear performance and environmental stability.



What is the difference between DIN 53516 and ISO 4649?



ISO 4649 is the current international standard for abrasion resistance testing of rubber and elastomers, having replaced the withdrawn DIN 53516. The test methods are closely similar — both use a rotating drum with standardised abrasive paper and express results as volume loss — but ISO 4649 provides more specific protocols, including options for rotating and non-rotating test piece configurations.



How does hardness affect abrasion resistance in cast polyurethane?



The relationship between hardness and abrasion resistance in cast PU is application-dependent. Higher hardness generally improves performance under sliding contact abrasion. In impact-abrasion environments, softer and more resilient grades can outperform harder formulations by absorbing impact energy rather than allowing surface crack propagation. Selection should be based on the dominant failure mode — sliding wear, impact, or both.



Where can I source HYPERLAST™ and DIPRANE™ prepolymers in Europe?



Safic-Alcan is the authorised European distributor of Dow Polyurethanes, covering the HYPERLAST™, DIPRANE™, VORASTAR™ and DURAMOULD™ ranges across France, the UK, Benelux, the Nordics, DACH (Germany, Austria, Switzerland), Spain, Portugal and most CEE countries. Contact the local Safic-Alcan team for technical data sheets, sample requests and formulation guidance.



Is polyurethane more tear resistant than rubber?



Yes. Cast polyurethane typically combines higher tear strength with lower abrasion loss than natural rubber or SBR, which extends part life in cutting and impact wear.



Which Dow prepolymer should I use for abrasion-resistant parts?



DIPRANE polyester prepolymers for dry, high cut and tear wear; HYPERLAST polyether grades for wet or dynamic applications. Our team can match grade and hardness to your part.



Sources



DIN 53516 / ISO 4649 abrasion test methodology (Kremer-Tec) · &nbsp;



Polyurethane material testing and validation (Pepson PU) · &nbsp;



Polyurethane industrial applications — performance data (Pepson PU) · &nbsp;



Dow Hyperlast DIPRANE™ and HYPERLAST™ product line announcement (WebWire) · HYPERLAST™ and DIPRANE™ mining and quarrying applications (Dow) · &nbsp;



Polyether TDI prepolymer properties overview · &nbsp;



REACH Regulation — European Chemicals Agency


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