Does CBS affect the processing of rubber goods?

Due to the resulting low concentration of CBS, a considerable exposure to CBS during the processing of rubber goods is not expected. Therefore, the processing of rubber, e.g. cutting, melting, is not considered in this report. Occupational exposure limits for CBS have not been established in Western Europe and USA.

How much CBS can be retained in a rubber product?

Taking into account that the maximum concentration of CBS in the uncured compounds is 3.5 % (technical rubber), the amount of CBS that can be retained in the finished product is limited to 0.2 %. Due to the resulting low concentration of CBS, a considerable exposure to CBS during the processing of rubber goods is not expected.

How vulcanization accelerator is used in rubber goods manufacture?

CBS is exclusively used as vulcanization accelerator in rubber goods manufacture. Vulcanization transforms the rubber from the thermoplastic into the elastomeric state at temperatures between 150 and 200 °C. CBS is loaded to the rubber in concentrations of 0.5– 1% (ww) but it breaks down during the curing process.

Is CBS a rubber accelerator?

Almost all rubber compounds on the market contain rubber accelerator as CBS in a wide range of products, but it is difficult to know which rubber product contain which rubber accelerants. Therefore the use of CBS in consumer product cannot be ruled out completely.

Is CZ soluble in benzene?

CBS is gray-white powder/granule with a little odor no poison, density 1.31-1.34.Soluble in benzene, boluene, chloroform, CS2, CH2Cl2 acetone, ethyl acetate, hardly soluble in alcohol. Insoluble in water, gasoline, acid/alkali with lower concentration. CZ is a medium fast primary accelerator, suitable for NR, IR, SBR, NBR, HR and EPDM.

How much air is released from a generic rubber manufacturing site?

Releases to air from a generic rubber manufacturing site have been estimated according to OECD emission scenario document to be 31 kg/day expressed as unreacted CBS. It is noted, that the major part of this amount is expected to be released in form of breakdown products.