RAYWAY™ Rubber Accelerator PVI(CTP)

This product is an efficient vulcanization inhibitor for natural rubber SBR, BR, IIR, CR, EPM, EPDM, and NBR using hyposulfonamide and thiazole accelerators in the sulfur vulcanization system. A small amount of addition can significantly improve processing safety, help speeds up some processing of rubber products, and save raw materials and energy. It can also improve the storage stability of rubber materials and prevent natural vulcanization when stored. This product has a regenerative recovery effect on rubber materials that have been subjected to high heat or have scorched. The recommended dosage is 0.1-0.3 parts.
anti-scorching agent PVI has an obvious effect in the vulcanization system containing sulfur yellow, if no sulfur yellow is added, the effect of anti-scorching agent PVI is weak. anti-scorching agent PVI and sulfur yellow when used, hyposulfophthalamide promoter have a delayed effect due to the occurrence of cross-linking before the hyposulfophthalamide must be transformed into polysulfide benzene and exposure to wow intermediates. Before the sulfurization and sulfur yellow content were significantly reduced, the hyposulfophthalamide promoter has been consumed in large quantities. Up to this point, the intermediate 2-mono-Lu-benzo-aeroxane (MBT) was used as an autocatalyst for the reaction of hyposulfophthalamide and sulfur yellow. The anti-coke agent PVI removed MBT during this continuous autocatalytic reaction, thus delaying the formation of polysulfobenzo-piperazine and the chemical reactions that occurred prior to cross-linking. The anti-scorching agent PVI reacts with MBT to form N, N dicyclohexyl monodithiobenzoamphibole. The effect of anti-scorching agent PVI on the content of vulcanizing agents and intermediates is that the coke inhibitor PVI has been consumed in large quantities before the significant change in the content of the secondary sulfophthalimide promoter, and therefore the coking time is significantly delayed.


Molecular Formula: C14H15O2SN
Molecular Weight: 261.34
CAS NO. : 17796-82-6




Acceptable end-product

Appearance  (Visual inspection)

 White powder or granular

Initial M.P, oC        ≥


Loss on drying, %      ≤


Ash, %                     ≤


Toluene insoluble,%     0.50

White powder

Product Data

Specific gravity: 1.25–1.35. Soluble in acetone, benzene, toluol, diethyl ether, ethyl acetate, hot CCl4 and hot alcohol, slightly soluble in gasoline, and insoluble in derosene and water.


The material is a very effective anti-Coke agent, for all of the sulfur vulcanization of two vinyl and low saturation of the rubber, natural rubber and styrene butadiene rubber, nitrile rubber, butyl rubber, neoprene, plastic isoamyl, butadiene rubber, EPDM rubber, etc. have good anti-burning results, and other rubber chemicals, when used in conjunction with the activity, will not be affected. No foam, pollution or other adverse side effects. To substantially increase the storage compound stability during storage to prevent natural curing. The previous anti-Coke agents, the effectiveness and use less.


The product should be stored in a dry and cooling place with good ventilation, avoiding exposure of the packaged product to direct sunlight.


25kg plastic woven bag, paper with plastic film bag, kraft paper bag.