Dicumyl peroxide

Dicumyl peroxide (CAS 80-43-3), also known as cumyl peroxide, is an organic peroxide used industrially as a cross-linking agent and free-radical polymerization initiator.

Where is Dicumyl peroxide used?

• Rubber and tire manufacturing: cross-links EPDM, silicone, and natural rubber compounds to improve heat resistance and mechanical durability
• Wire and cable: cures polyethylene insulation, producing XLPE for medium- and high-voltage applications
• Automotive and aerospace: cures molded rubber seals, gaskets, and vibration-dampening parts
• Polymer modification: initiates controlled grafting and polymerization reactions, including impact-modified polypropylene compounds
• It enables controlled vulcanization of elastomers and curing of thermoplastics.

Good to know: Peroxide curing outperforms sulfur systems in long-term heat aging scenarios.

Commercial specifications

• Active oxygen content typically specified at 98% purity minimum
• Concentrations and carrier-based masterbatch forms available for handling and dosing