Carbon black is a fine carbon pigment produced through the incomplete combustion or thermal decomposition of hydrocarbons.
It originates from coal tar, petroleum products, vegetable matter, or ethylene cracking processes and consists of very small particles created under high-temperature, controlled conditions.
Today, carbon black is one of the most versatile industrial pigments. While most global production is used in rubber applications, about 10% is dedicated to specialty markets such as coatings, inks, plastics, UV stabilizers, antistatic materials, and conductive compounds. Over centuries, carbon black has evolved from a simple ancient pigment to a highly engineered material essential for modern high-performance applications.
This article explores its historical origins, modern manufacturing processes, performance characteristics, coloristic properties, and the sustainability initiatives shaping the next generation of specialty carbon blacks.
A Short History of Carbon Black in Coatings and Inks
Carbon black’s story begins in prehistoric art. Early humans used pigments made from iron oxides and calcite, but they also produced carbon black by burning wood, bones, or plant matter. These primitive “lamp black” pigments were then mixed with spit or fat to decorate cave walls—such as the world-famous charcoal drawings of the Chauvet cave in France.
Ancient civilizations in China and Egypt refined carbon black production further. They used carbon black mixed with natural binders to create inks and dyes, and in Egypt, it also appeared in cosmetics such as kohl, originally made from galena and later often containing carbon black particles.
The Greeks and Romans developed early furnace systems to produce larger quantities of lamp black.
With the invention of the printing press in the 15th century, demand for carbon black increased dramatically, and the Industrial Revolution introduced the channel black method, enabling mass production at lower cost.
The 20th century marked a turning point with two major innovations:
- Furnace black process — combustion of petroleum derivatives in high-temperature furnaces
- Acetylene black — thermal decomposition of acetylene, producing ultra-fine carbon black for specialty applications
These technologies laid the foundation for the modern specialty carbon blacks used in coatings and inks today.
How Carbon Black Is Made: Key Manufacturing Processes
Several production methods exist, each influencing particle size, surface area, structure, dispersion, gloss, and jetness.
Lamp Black
A classical method in which aromatic oils burn under a fireproof hood. The gap between tank and hood controls air access and incomplete combustion.
Characteristics:
- Larger particles
- Broad particle size distribution
- Lower gloss and a softer undertone
Lamp black remains relevant for specific coatings and artistic materials.
Gas Black and Channel Black
Channel Black (older process)
Historically produced by burning gas under water-cooled metal channels to collect carbon deposits.
Gas Black (modern specialty process)
Developed in 1934 by Harry Kloepfer (Degussa), this process evaporates hydrocarbons with hydrogen-rich carrier gas and deposits very fine particles on water-cooled drums.
Characteristics:
- Very narrow particle size distribution
- Excellent dispersion
- High jetness and bluish undertone
- Ideal for high-end coatings, inks, and automotive finishes
Although channel black shares some properties with gas black, it should not be confused with this more advanced technology.
Furnace Black — The Dominant Method
Today, most carbon black is produced using the furnace process. Heavy aromatic oils are injected into a high-temperature combustion zone, where they thermally decompose.
Benefits:
- Wide range of particle sizes (coarse to ultra-fine)
- Highly adaptable surface area and structure
- Tailored pigment properties
- Low oil absorption and excellent color strength
After surface treatment, furnace blacks such as COLOUR BLACK FW 310, FW 255, and NEROX® 600 & 510 deliver outstanding performance in both water-borne and solvent-borne systems.
Surface Treatment: Enhancing Performance in Coatings and Inks
Carbon black consists of paracrystalline carbon layers with surface valences saturated by organic groups. Surface chemistry greatly impacts compatibility with binders and solvents.
Oxidation as a Common Treatment
Oxidizing the surface increases oxygen-containing groups, especially carboxyl groups, which improves:
- Pigment wetting
- Mill base viscosity
- Dispersion stability
- Jetness, gloss, and undertone
- Compatibility in water-based systems
For instance, NEROX® 600 delivers high jetness and gloss in industrial coatings with lower viscosity and improved flocculation resistance compared to conventional furnace blacks.
Understanding Particle Size, Structure, and Aggregation
Carbon black is not supplied as individual particles but as aggregates and agglomerates:
- Primary particles: a few nanometers to ~100 nm
- Aggregates: chemically bonded particles (a few hundred nm)
- Agglomerates: loosely bound clusters through van der Waals forces
Key properties influenced by particle size and structure:
- Jetness
- Undertone (bluish vs. brownish)
- Gloss
- Tint strength
- Dispersion behavior
- Electrical conductivity
Higher structure generally means easier dispersion but increased viscosity.
Carbon Black in Coatings: Coloristic and Functional Performance
Specialty carbon blacks serve two major roles:
1. Coloristic Properties
- Mass tone black: smaller particles = higher jetness + bluish undertone
- Tinting: finer particles shift tint to brownish; coarser particles give a bluish tint
- Gloss: finer particles + high gloss = deeper, more intense jetness
- Transparency effects: fine particles reduce transparency but warm tone; coarse particles offer cooler tones and clarity
Preferred grades include:
- Fine oxidized gas blacks: COLOUR BLACK FW 2, FW 200
- Untreated fine gas blacks: FW 285
- Surface-treated furnace blacks: NEROX® 510 & 600, COLOUR BLACK FW 255 & FW 310
2. Functional Performance
Carbon black improves:
- UV resistance and weatherability
- Durability in automotive coatings
- Electrical conductivity for antistatic and conductive inks
- Thermal stability and chemical resistance
Untreated furnace blacks with high structure offer the best conductivity.
Sustainability: The Next Frontier for Carbon Black
Growing environmental awareness is pushing the carbon black industry toward lower-impact solutions. Key developments include:
Alternative Feedstocks
- Renewable oils
- Recovered pyrolysis oils from end-of-life tires
- Bio-based methane
Process Improvements
- Higher yield
- Lower CO₂ emissions
- Energy-efficient reactors
A notable step forward is Orion’s 100% bio-circular carbon black, made from renewable feedstocks that do not compete with food or feed sources.
These innovations help formulators reduce the carbon footprint of high-performance coatings without compromising jetness, dispersion, or durability.
Supporting Your Formulation Challenges
Carbon black has evolved from prehistoric cave pigments to precision-engineered materials for advanced coatings and inks. At Safic-Alcan, we work closely with Orion S.A. to supply a full range of specialty carbon blacks tailored to formulation requirements.
Our experts support formulators in selecting pigments with the right balance of:
- Jetness
- UndeBrtone
- Dispersion stability
- Viscosity control
- Sustainability performance
Whether you are designing deep-black automotive coatings, conductive inks, industrial finishes, or bio-circular formulations, we are here to help.
Explore our online catalog or reach out to your local Safic-Alcan contact.
🔍 FAQ: Quick Answers
How is carbon black made?
Through incomplete combustion or thermal decomposition of hydrocarbons at high temperature. Different processes create different particle sizes and surface properties tailored to each application.
Why is carbon black important in coatings and inks?
It delivers intense jetness, tint strength, UV resistance, long-term durability, and—depending on the grade—electrical conductivity.