Full definition
The single most important reinforcing filler in the rubber industry, produced by incomplete combustion or thermal decomposition of hydrocarbons (oil or gas). Carbon black dramatically increases tensile strength (2-5x), abrasion resistance (5-10x), tear resistance, and UV protection of rubber compounds. Classification per ASTM D1765 by particle size and structure: N110-N121 (super abrasion furnace, finest particles 15-25 nm, highest reinforcement for tire treads), N220-N234 (intermediate, excellent balance for belts and hoses), N330 (high abrasion furnace, general purpose), N550-N660 (fast extrusion, semi-reinforcing for belt covers and extrusions), N762-N990 (thermal blacks, largest particles 200-500 nm, minimal reinforcement, used as filler for cost reduction). Dosage: typically 30-80 phr depending on compound requirements. Per ASTM D1510 (iodine adsorption), D2414 (structure/DBP). Carbon black also makes rubber electrically conductive (antistatic grades). Global production: ~15 million tonnes/year, dominated by tire industry (70%+).