Abstract: A moldable, extrudable, thermally crosslinkable composition of matter containing 50-99% by weight fluoropolymers, in which 50-95% of the polymer content of the blend is an FKM fluoroelastomer and 5-50% of the polymer content of the blend is one or more thermoplastic PVDF polymers or copolymers containing at least 70% by weight vinylidene fluoride monomer units, and the crosslinked articles derived from processing and curing the subject composition of matter.

Abstract: The invention involves a means of increasing the scorch delay period (scorch time) for standard bisphnol-cured fluoroelastomers (abbreviated as “FKM;” these are copolymers of vinylidene fluoride and hexafluoropropene, optionally also containing additional monomers such as tetrafluoroethylene). The invention entails particular subtituted monophenols (butylparaben or propylparaben) and/or mixtures of these with methylparaben and/or inorganic solids, and the inclusion of these particular substituted monophenols and/or blends in an FKM compound. These particular substituted monophenols are effective as scorch inhibitors of bisphenol-cured FKM, and are also effective as processing aid.