Patent ID: 6846865

Claim:
A silicone rubber formulation, comprising: from 0.5 to 60% by weight of a hydrophobic silica having the following properties: carbon content >3.1% methanol wettability >60% reflectance >94% BET/CTAB ratio >1 and <3 DBP absorption <230 g/100 g BET surface area 50-110 m 2 /g CTAB surface area >30 m 2 /g water vapor absorption at 30° C. and <1.3 30 AH water vapor absorption at 30° C. and <1.7; and 70 AH from 30-99.5% by weight of an organopolysiloxane of the formula Z n SiR 3−n —O—[SiR 2 O] x —SiR 3−n —Z n wherein R=alkyl, alkoxy, aryl, hydroxy, hydride, alkenyl radicals, having from 1 to 50 carbon atoms, unsubstituted or substituted by O, S, F, Cl, Br, I, in each case identical or different, and/or polystyrene, polyvinyl acetate, polyacrylate, polymethacrylate, and polyacrylonitrile radicals having 50-10,000 repeating units, Z=H, OH, Cl, Br, amino, amineoxy, alkenyloxy, aryloxy or phosphate radicals, it being possible for the organic radicals to carry up to 20 carbon atoms, in each case identical or different, n=1-3, and x=100-15,000.