tert-butyl peroxybenzoate

Tert-butyl peroxybenzoate (CAS 614-45-9), commonly sourced under the abbreviation TBPB or as tert-butyl perbenzoate, is an organic peroxide used as a free-radical initiator and curing agent across polymer and coatings manufacturing. Its controlled decomposition temperature makes it a practical choice for medium-temperature cure systems where processing window and final product performance must be balanced. In rubber and tire production, TBPB initiates cross-linking of elastomers.

This process improves mechanical strength and heat resistance in finished compounds. Unsaturated polyester resins and gel coats in composites manufacturing rely on TBPB as a cure initiator, particularly where surface quality and cure speed are critical. Coatings formulators use it to drive radical polymerization in acrylic and styrenic systems, enabling consistent film formation at elevated cure temperatures. In plastics processing, it functions as a peroxide crosslinker for polyethylene.

It also serves as a grafting initiator for modifying polymer backbones. TBPB is supplied as a clear to pale yellow liquid, typically at concentrations of 98% pure or as diluted formulations for safer handling in industrial settings. It is available in technical grade, with supply packaged to meet peroxide transport and storage regulations. Drum and IBC quantities are standard for industrial buyers seeking reliable chemical performance.