Silicon composition, elastic revolution body and fixing device using the composition

A fixing device comprising a pair of rollers for passing therebetween a toner-supporting material carrying an unfixed toner image to fix the toner image onto the toner image-supporting material, wherein at least one of said pair of rollers comprises an elastic surface layer formed from a silicone rubber composition wherein, the silicone rubber composition comprises an addition reaction-type silicon rubber composition prepared from a mixture of

• (A) a dimethylpolysiloxane having a vinyl group, a methylhydrogenpolysiloxane and a platinum-based catalyst,
• (B) reactive group-containing modified silicic acid powder of which surface has been modified with (i) a compound selected from the group consisting of (a) an alkylsilane, (b) a hexamethyldisilazane, (c) a dimethylsilicone oil and (d) a mixture thereof, and (ii) an unsaturated group-containing silane compound, followed by drying and
• (C) inorganic fine powder impregnated with a surfactant, said inorganic fine powder having a pore diameter of 0.01 to 30 microns, an average particle size of 5 to 70 microns and an oil absorption of 200-800 ml/100 g, wherein said inorganic fine powder is impregnated with an amount of surfactant sufficient to produce said silicone rubber composition containing surfactant in a proportion of 0.1-10 wt % and wherein said surfactant is a fluorine-containing surfactant selected from the group consisting of fluorinated alkyl esters, perfluoroalkylpolyoxyethylene ethanol, perfluoroalkylcarboxylic acid salts, perfluoroalkylammonium salts, perfluoroalkylbetaine, perfluoroalkylamine oxide, perfluoroalkylethylene oxide adducts, perfluoroalkyl phosphates, non-dissociative perfluoroalkyl compounds and perfluoro-ethylene oxide adducts or a silicone-containing surfactant selected from the group consisting of polyether-modified silicone oil, epoxypolyether-modified silicone oil, alkylaralkylpolyether-modified silicone oil and amino-modified silicone oil.