PVI (N-(Cyclohexylthio)phthalimide), also known as CTP (Cyclohexylthiophthalimide), is a highly effective pre-vulcanization inhibitor and scorch retarder used in sulfur-cured rubber compounds. PVI is specifically designed to delay the onset of vulcanization during mixing, processing, extrusion, and calendaring operations, thereby significantly improving processing safety and reducing the risk of premature curing (scorch). It is particularly effective when used in combination with sulfenamide accelerators such as CBS, TBBS, and DCBS. PVI is widely used in the manufacture of tires, conveyor belts, hoses, seals, gaskets, footwear, and various technical rubber goods. By extending scorch time without significantly affecting the final cure rate, it allows rubber compounds to be processed at higher temperatures and speeds, improving manufacturing efficiency and product consistency. The product is typically supplied as a white to light yellow powder, crystals, or granules and is compatible with natural rubber as well as a wide range of synthetic elastomers. PVI helps maintain compound stability during storage and processing while supporting optimal vulcanization performance in the finished product. Due to its exceptional scorch-retarding properties and proven effectiveness in sulfur vulcanization systems, PVI has become an industry-standard processing additive for demanding rubber applications requiring enhanced production safety, improved process control, and superior manufacturing reliability.
Pre-vulcanization inhibitor and scorch retarder for sulfur-cured rubber compounds.
| CAS Number | 17796-82-6 |
|---|---|
| HS Code | 2930909595 |
| EC Number | 241-774-1 |
| UN Number | 3077 |