Trigonox® 21-CL50 is an efficient initiator for the production of Low Density Polyethylene (LDPE). It is used both for tubular and autoclave processes. In most cases a combination with other peroxides is used to ensure a broad reactivity range. Polymerization of styrene: In suspension polymerization processes, Trigonox® 21-CL50 can be used for the polymerization of styrene at approximately 90°C. Trigonox® 21-CL50 has an activity comparable with dibenzoyl peroxide (Perkadox® L-W75). Typically, Trigonox® 21-CL50 is used in combination with initiators such as tert-Butyl peroxybenzoate (Trigonox® C).