Definition
Accelerators are chemical substances that act as catalysts in the vulcanization process of rubber. They speed up the crosslinking reaction between rubber molecules and sulfur, resulting in stronger, more elastic, and durable rubber products.
Speed up vulcanization – shorten curing time and reduce the required temperature.
Control crosslink density – ensure consistent strength and elasticity.
Enhance rubber properties – improve resistance to heat, oil, chemicals, and extend service life.
Thiazoles (e.g., MBT, MBTS) – standard accelerators used for natural and synthetic rubber.
Sulfenamides (e.g., CBS, TBBS) – provide delayed action and excellent scorch safety; widely used in tire production.
Thiurams & Dithiocarbamates (e.g., TMTD, ZDBC) – ultra-fast accelerators, often used in combination with others.
Guanidines (e.g., DPG) – mainly used as secondary accelerators.
MBT (2-Mercaptobenzothiazole)
MBTS (Dibenzothiazyl disulfide)
CBS (N-Cyclohexyl-2-benzothiazole sulfenamide)
TMTD (Tetramethylthiuram disulfide)
DPG (Diphenyl guanidine)
Tires and automotive rubber parts (e.g., seals, O-rings)
Industrial conveyor belts and hoses
Footwear and various molded rubber products
