Flame Retardants in Plastics — EU REACH Compliance 2026

Any plastic part entering the European Union in 2026 has to clear two hurdles at once: does it meet the fire safety requirements for its application, and is the flame retardant chemistry it uses still legally permitted? For engineering plastics in electrical and electronic equipment, automotive components, construction, and appliances, these two questions are harder to align than they were a few years ago. Regulatory pressure on halogenated compounds — brominated flame retardants especially — has been building since the RoHS restrictions of 2006, and 2026 brings specific milestones worth tracking.

This article covers the current state of EU flame retardant compliance: what is restricted, what is under active review, and what halogen-free alternatives actually deliver — so compounders and procurement teams can make formulation decisions ahead of regulatory deadlines.

For a broader overview of REACH 2026 — SVHC candidate list updates, PFAS restriction progress, and more — see Safic-Alcan’s REACH 2026 restricted substances article.

What Flame Retardants Do in Plastics — and Why the Chemistry Matters

Flame retardants are synthetic chemicals that prevent materials from igniting and slow fire spread. They enter plastic products either as additives blended during compounding or as reactive compounds built into the polymer backbone during polymerization. In plastic materials, the additive approach is more common: the flame retardant is mixed into the polymer resin during compounding, changing how the finished part burns without altering the polymer chain itself.

Flammability in plastics is not a fixed property — it depends on the polymer, the additive package, part geometry, and the fire scenario. Flame retardants can give flammable polymers flame retardant properties and reduce fire risk. UL 94 classifications — from HB (horizontal burn) to V-0 (self-extinguishing within 10 seconds) — define the performance thresholds different applications require. A domestic appliance housing must meet a different standard than a printed circuit board substrate, and each target classification drives a different flame retardant loading and chemistry.

Flame retardant selection is both a performance and a regulatory decision. The chemistry options are broad — flame retardants comprise halogenated (including brominated), organophosphorus, nitrogen-based, intumescent systems, and various organic/inorganic compounds — but regulatory constraints on which substances are permitted in which applications narrow that space considerably.

Brominated Flame Retardants: The Regulatory Story

PBDEs and the RoHS directive

Brominated flame retardant restriction in the EU did not start with REACH — it started with RoHS. The RoHS directive requires the restriction of these hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), and polybrominated diphenyl ethers (PBDE), in electrical and electronic equipment. Since 2006, PBBs and PBDEs have been prohibited above 1,000 ppm in any homogeneous material in electrical and electronic products — so a plastic housing, resin substrate, or cable sheath containing a restricted brominated compound above that threshold fails RoHS, regardless of fire performance.

Polybrominated diphenylethers (PBDEs) are now banned or restricted in many countries because of their persistence, bioaccumulation potential, and toxicity. High lipophilicity — log Kow values between 5.74 and 8.27 — drives their persistence, bioaccumulation, and biomagnification in the environment. Half-lives of certain congeners in the human body range from one to twelve years. Penta- and octa-BDE commercial mixtures have been listed as persistent organic pollutants (POPs) under the Stockholm Convention.

REACH and the expanding SVHC landscape

REACH operates through a different mechanism — it applies to all articles placed on the EU market, not just electrical and electronic equipment. Several brominated flame retardant compounds are already on the SVHC (Substances of Very High Concern) Candidate List, which means articles containing them above 0.1% by weight must be disclosed to downstream customers and, in B2C supply chains, to consumers on request.

In January 2026, ECHA opened a formal Call for Evidence on certain non-polymeric aromatic brominated flame retardants in electrical and electronic products, construction products, and textiles — running from January 21 to March 18, 2026. A restriction proposal under Annex XVII of REACH is in preparation. Affected sectors — electronics, construction plastics, textile compounds — should expect a regulatory deadline in months rather than years.

RoHS and REACH are not the same compliance standard. RoHS compliance does not mean halogen-free. PBBs and PBDEs are just two entries in the broader category of brominated flame retardants. Many other brominated substances remain in use — but are candidates for future SVHC listing or Annex XVII restriction. Formulators who have cleared RoHS but not reviewed their full BFR inventory against the REACH candidate list have an open compliance gap.

Alternative BFRs: not automatically safer

When PBDEs were restricted, the market moved to alternatives — compounds such as decabromodiphenyl ethane (DBDPE) and tribromophenol — that offered comparable fire performance without the structures named in existing restrictions. The problem is that there is a wide range of alternative BFRs that may possess similar hazardous properties to the compounds they replaced, and for many of them PBT (persistence, bioaccumulation, toxicity) data is thin. ECHA’s restriction work on non-polymeric aromatic brominated flame retardants addresses that directly: substance-by-substance restriction tends to produce substitution cycles rather than a genuine shift to safer chemistry.

Halogen-Free Flame Retardants: Performance Grades for Plastics

Most compounders have been developing halogen-free flame retardant (HFFR) alternatives for over a decade — the regulatory direction has been clear for long enough. The transition is more advanced in electrical and electronic equipment than in construction plastics and automotive components, where the mechanical and thermal performance requirements are more demanding. What each HFFR chemistry class actually delivers — and where it falls short — matters for any formulation decision.

Phosphorus-based flame retardants

Phosphorus-based compounds are the main halogen-free alternative across most engineering plastic matrices. Phosphorus-containing flame retardants can be utilized as additives or incorporated into the polymer chain during polymerization, and act in the condensed or gaseous phase depending on their chemistry and the host polymer. In the condensed phase, thermal decomposition produces phosphoric acid structures that promote char formation — a protective layer that limits heat and mass transfer during combustion. This mechanism works particularly well in oxygen-containing matrices such as polyesters, polyamides, and ester-linked resins.

Reactive flame retardants have the advantages of little influence on the physical properties of polymers and low tendency to migrate out . Driven by demand for non-halogenated options, phosphorus-based compounds have become the main alternative in polyurethane, PPS, polyamide, and other engineering polymer systems. The main limitation is cost: the cost of halogen-free flame retardant plastics is higher than that of halogenated plastics, which is why achieving V-0 classification at the lowest viable additive loading remains an active focus of formulation work.

Aluminum diethylphosphinate and ammonium polyphosphate are the most widely used phosphorus-based additive systems in engineering plastics. In ABS and PC/ABS alloys — common in appliance housings and consumer electronics — phosphorus-based flame retardant additives provide a more environmentally friendly alternative to halogenated systems, though their effect on impact energy requires optimization of loading levels and particle morphology.

Synergistic systems and intumescent formulations

Single-chemistry flame retardant systems rarely hit all targets at once — fire performance, mechanical durability, and processing compatibility tend to pull in different directions. Most current HFFR formulations use synergistic mixtures: a primary flame retardant combined with a synergist that amplifies its effectiveness, reducing the total additive loading needed and preserving more of the base polymer’s properties.

Phosphorus-nitrogen synergistic systems work well in polyolefin matrices such as polypropylene, where phosphorus alone has limited condensed-phase activity. The nitrogen component drives intumescence — the char layer physically swells during combustion, forming an insulating barrier that slows heat transfer to the unburned polymer below. Flame retardants are incorporated into textiles, construction materials, electronics, and consumer products through physical addition — and this intumescent approach is now standard in construction plastic applications such as cable management systems, pipe insulation, and structural panels, where UL 94 V-0 or European Euroclasse B and C fire classifications apply.

Research into nanocomposite approaches — layered double hydroxides or organoclays combined with phosphorus flame retardants — shows performance gains in demanding polymer systems, though cost keeps them out of commodity plastic formulation for now.

Inorganic flame retardants: aluminum trihydrate and magnesium hydroxide

In cost-sensitive applications where processing temperatures allow — principally polyolefins, PVC compounds, and cable insulation — aluminum trihydrate (ATH) and magnesium hydroxide (MDH) deliver flame retardancy without hazardous substance concerns. Both release water vapor during decomposition, diluting combustible gases and cooling the combustion zone. High loadings are required (40–65% by weight), which limits their use where mechanical properties need to be preserved.

From a regulatory standpoint, both are clean: no SVHC status, no REACH or RoHS restrictions, and compatible with recyclability requirements. Wire and cable insulation for infrastructure applications is their natural home, where the Construction Products Regulation and the Low Voltage Directive impose fire safety and environmental requirements at the same time.

Practical Compliance in 2026: What Formulators Need to Do

• Audit the full BFR inventory. RoHS addresses PBBs and PBDEs — REACH’s SVHC list goes further. The restriction proposal on non-polymeric aromatic brominated flame retardants (Call for Evidence, January 2026) covers substances used in electrical and electronic products, construction products, and textiles. Any compounder using brominated flame retardants in these applications should check each compound’s SVHC status and watch the ECHA restriction timeline.
• Understand the RoHS–REACH interaction. Passing one does not mean passing the other. Articles containing SVHC Candidate List substances above 0.1% by weight require disclosure to the downstream supply chain — whether or not those substances appear in RoHS. Electronics manufacturers sourcing plastic compounds need to verify SVHC presence, not just RoHS compliance.
• Evaluate phosphorus-based alternatives against the full performance specification. Halogen-free phosphorus systems can match brominated flame retardants on UL 94 classification in many engineering polymer matrices, but their effect on tensile strength, elongation, thermal stability, and processing needs to be validated at the compound level. The interaction with the base resin — especially in PPS, polyamide, and ABS/PC blends — cannot be predicted from chemistry alone.
• Plan for PFAS exposure in fluoropolymer-based formulations. PFAS restrictions are moving through a separate regulatory track, but formulators using fluoropolymers as processing aids or in specialty flame retardant systems should note that ECHA’s SEAC opinion on the broad PFAS restriction is expected by end of 2026, with a Commission decision likely afterward. Any compound system relying on fluoropolymer components needs to be assessed for regulatory exposure alongside BFR compliance.