Dicumyl peroxide is mainly used as cross - linking agent for polymers and elastomers. Polymers which can be cross - linked with organic peroxides are used to produce hose, wires, tires, rubber seals, etc. Dicumyl peroxide can also be used as flame retardant synergist in expanded polystyrene (EPS). In that case, the peroxide is incorporated in small quantities in EPS, and will catalyze the flame retardant action in case of heating. The free radicals are mainly in application of : * High polymer polymerization initiators- ex. PVC , LDPE , styrene series , acrylic series …etc. * Rubber, elastomer crosslinking agent. * Unsaturated polyester resin curing agent. * The polypropylene vis-breaking.