3,5,5-Trimethylhexanoyl peroxide

3,5,5-Trimethylhexanoyl peroxide (CAS 3851-87-4), also supplied commercially as Di-(3,5,5-trimethylhexanoyl) peroxide, is an organic peroxide used as a free-radical initiator and curing agent in polymer and rubber manufacturing.

Where is 3,5,5-Trimethylhexanoyl peroxide used?

• Plastics: free-radical polymerization of vinyl monomers, including PVC, polystyrene and acrylics
• Rubber: cross-linking agent for targeted vulcanization profiles, particularly in EPDM and silicone elastomers
• Coatings: radical-initiated cure of resin formulations where thermal activation is preferred over photoinitiators
• Adhesives and sealants: cure of acrylic and peroxide-curable systems requiring defined pot life and throughput temperatures
• Its controlled decomposition profile suits low-to-moderate temperature polymerization where precise initiation is required.

Good to know: Classified as an organic peroxide; buyers should confirm defined storage requirements with their supplier to ensure product stability.

Commercial specifications

• 75% active concentration in a diluent
• Temperature-controlled packaging