N-Cyclohexyl-2-benzothiazolesulfenamide

N-Cyclohexyl-2-benzothiazolesulfenamide, commonly known as CBS and sold under trade names including Curax, DURAX, Conac S, and Conac A, is a sulfenamide-class accelerator used in rubber vulcanization. It carries CAS number 95-33-0 and EC number 202-411-2, with no assigned E-code.

CBS functions as a delayed-action vulcanization accelerator in natural and synthetic rubber compounding. It reacts with sulfur during heat processing to form crosslinks between polymer chains, providing a controlled scorch delay followed by a fast cure rate. This profile makes it particularly suited to tire manufacturing, where consistent cure behavior across thick rubber sections is required.

CBS is supplied as a solid and is subject to REACH registration requirements within the European Union. Procurement teams should confirm compliance documentation, including Safety Data Sheets and substance registration status, prior to sourcing. It is classified under HS code 2934.20.8000 for customs and import purposes.