| 摘要 |
<p>A silicone elastomer composition which has hardness of 80 durometer Shore A, low structuring and low specific gravity comprises: (a) 50 to 90 parts by weight of an alkenyl terminated linear diorganopolysiloxane gum having a viscosity in the range of 1,000,000 to 200,000,000 centipoise at 25 DEG C and having an alkenyl concentration of about 0.01 to 0.05 mole percent of siloxy units; (b) 10 to 30 parts by weight of an alkyl terminated diorganopolysiloxane gum having a viscosity in the range of 1,000,000 to 200,000,000 centipoise at 25 DEG C; (c) 3 to 20 parts by weight of an alkenyl containing diorganopolysiloxane gum having a viscosity varying from 100,000 to 200,000,000 centipoise at 25 DEG C and having an alkenyl concentration of about 0.5 to 15 mole percent of siloxy units; (d) 40 to 60 parts by weight of treated fumed silica with surface area varying from about 130 to 350 m<2>/g; and (e) 0.5 to 3.0 parts by weight of a hydroxy terminated polysiloxane fluid having about 0.5 mole percent alkenyl.</p> |
