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Abstract

A silicone rubber composition, which comprises 100 parts by weight of vinyl group-introduced methylphenylvinyl-based silicone rubber obtained by copolymerization of dimethylsiloxane copolymerization units as the main component with 3-30 mol. % of methylphenylsiloxane copolymerization units, and 0.2-8 parts by weight of an organic peroxide, where introduction of vinyl groups into the silicone rubber can be attained generally by copolymerization of 0.1-5 mol. % of methylvinylsiloxane. When silica is used as a filler, it is desirable to use a surfactant for silica, and water together. Owing to distinguished low-temperature characteristics and blister resistance, the present silicone rubber composition can be used a suitable seal material for a high-pressure hydrogen gas storage tank, for example, to storage under 70 MPa, and particularly as suitable vulcanization-molding materials for O rings, packings, gaskets, oil seals, valves, etc.

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First Claim