Perkadox 14S-FL is used as a crosslinking agent/polymerization initiator for plastics. Added in the amounts of .5 to 1% to fortify the chemical bond of the cured resins such as styrenes, polyesters (including thermoset resins), vinyl acetate, acrylonitrile, acryl esters, diallyl phthalate and other similar resins and/or combinations thereof. Heat may also be supplied to increase the rate of polymerization. Used with Perkadox CH-50 and many other curatives.