Silicone rubber composition, silicone rubber sponge composition, and silicone rubber-covered wire

This invention relates to a silicone rubber composition of the organic peroxide curing type, especially such a silicone rubber composition suited for wire coating, a silicone rubber sponge composition, and a silicone rubber-covered wire. A silicone rubber composition comprising (A) an organopolysiloxane, (B) an inorganic filler, typically fumed silica, and (C) a specific halogen-free organic peroxide, typically 1,6-bis(p-toluoylperoxycarbonyloxy)hexane or 1,6-bis(benzoylperoxycarbonyloxy)hexane is safe and lends itself to atmospheric hot air vulcanization so that it can be extrusion vulcanized into silicone rubber having satisfactory physical properties without voids or surface tack. The silicone rubber composition is extrusion molded around an electrical wire, constructing a covered wire.