Carbon black

Carbon black has a wide range of physical and chemical properties that make it widely applicable:

• High carbon content: consists of more than 95% carbon.

• Reinforcing effect: improves the tensile strength, abrasion resistance and elasticity of rubber.

• UV absorption: protects materials against UV radiation and ageing.

• Electrical conductivity: special grades of carbon black can increase conductivity.

• Colouring effect: acts as a black pigment with high opacity.

Carbon black is produced industrially by controlled combustion or thermal decomposition of hydrocarbons:

Production processes

• Furnace black process: the most common process; hydrocarbons are burned at high temperatures.

• Thermal process: hydrocarbons are thermally cracked to produce carbon black.

• Acetylene black: special process for producing conductive carbon black.

• Gas black process: uses gas as the feedstock to produce particularly fine carbon black.

Carbon black is divided into different types, depending on its particle size, structure and specific properties:

Type of carbon black	Properties	Typical applications
Reinforcing carbon black	Increases strength and abrasion resistance	Tyres, conveyor belts, seals
Pigment carbon black	Provides an intense black colour	Colourants, plastics, printing inks
Conductive carbon black	Increases electrical conductivity	Antistatic materials, electrodes
Thermal black	Low structure, non-reinforcing	Seals, flexible materials

Carbon black is used in numerous industries and products:

Rubber industry

• Tyres: increases abrasion resistance and service life.

• Seals and hoses: reinforces mechanical properties and protects against ageing.

Plastics industry

• UV protection: extends the durability of plastic products through UV absorption.

• Colouring: gives plastics a deep black colour.

Paint and coatings industry

• Pigment: intense black shades with high opacity.

• Protective layers: use in anti-corrosion paints and coatings.

Electrical industry

• Conductive materials: use in antistatic or conductive plastics.

• Batteries: carbon black as an additive to improve the conductivity of electrodes.

Carbon black offers a wide range of advantages that make it indispensable in industry:

• Improved mechanical properties: increases the strength and durability of rubber and plastics.

• UV protection: reduces material ageing by absorbing UV rays.

• Cost efficiency: carbon black is an inexpensive filler with versatile uses.

• Colouring: gives products an even, deep black colour.

Using carbon black also involves some challenges:

• Health and environmental aspects: fine carbon black particles can be harmful to health and must be handled carefully.

• Processing: carbon black particles tend to form agglomerates, which makes even distribution in the material more difficult.

• Regulatory requirements: the use of carbon black is subject to strict rules, particularly in the European Union (e.g. the REACH Regulation).

• Is carbon black harmful? Industrially produced carbon black is safe when handled properly, but fine particles can be harmful if inhaled or in contact with skin.

• How is carbon black recycled? In some cases, carbon black can be recovered from end-of-life tyres or other products and reused.

• What alternatives to carbon black are there? Fillers such as silica or organic pigments can serve as substitutes in certain applications, but do not always offer the same properties.

• Is carbon black only used in black products? No. Although carbon black is mainly used for black materials, it is also used to improve mechanical properties in coloured materials.

Carbon black is an indispensable constituent in the rubber, plastics and paint industries. Its ability to improve mechanical properties, provide UV protection and colour products makes it one of the most widely used fillers in the world. Despite its challenges, carbon black remains an essential raw material in numerous applications thanks to its versatility and cost efficiency.