di-tert-butyl peroxide

Di-tert-butyl peroxide (CAS 110-05-4), commonly known as DTBP, is an organic peroxide used as a high-temperature free-radical initiator and cross-linking agent across rubber and polymer manufacturing.

Where is di-tert-butyl peroxide used?

• Rubber and tire production: cross-linking
• EPDM, silicone, and natural rubber compounds: vulcanizates with improved heat resistance compared to sulfur-cured alternatives
• Polyethylene and polypropylene: controlled degradation or grafting, modifying melt flow and mechanical properties for film, pipe, and wire insulation grades
• Styrenic and acrylic monomers: polymerization initiator
• Unsaturated polyester resins: elevated-temperature cure cycles that reduce cycle times in compression molding
• A high-temperature kick-off point is required to match reactor conditions.

Good to know: Its relatively high decomposition temperature makes it suitable where lower-temperature peroxides would activate prematurely during compounding or processing.

Commercial specifications

• Typically at concentrations of 98% or higher for industrial use
• Diluted or blended formulations on inert carriers for transport