PVI or CTP also known as N-(Cyclohexylthio)phthalimide used as ant scorching agent, is an flame retardant for NR and synthetic diene rubbers. PVI is a pre-vulcanization inhibitor which enables processing safety to be controlled in a predictable manner in sulphur curable compounds.

What are the benefits and the features?

  • PVI pre-vulcanization inhibitor results in little or no influence on curing characteristics or vulcanize characteristics.
  • PVI is particularly useful for improving efficiency of processing operations such as mixing.
  • PVI is non-staining but can give a slight discoloration
  • It is possible to adjust processing safety by changing dosage of PVI


  • Rubber Compounding (hoses and belts)
  • Tires and automotive

Robert Slinger

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