The foamed silicone rubber is based on a condensation-type hydroxyl-terminated silicon raw rubber, the hydroxyl-containing hydrogen-containing silicone oil is a foaming agent, and the vinyl platinum complex is a catalyst (the heating catalyst is dibutyltin dilaurate). A perforated sponge-like elastomer formed by foaming at room temperature. In order to improve the quality of the foam, some other components, such as silicone-containing oil, are added to make the vulcanization process produce more gas; the foam feels and the density is reduced. The addition of diphenylsilyl glycol not only controls the structure of the foam, but also controls the viscosity increase of the rubber during storage, but the amount thereof cannot be too much, otherwise the electrical properties of the foam will be affected. In order to improve the physical and mechanical properties of the foam, a transparent silicone rubber may also be added. The amount of the vinyl complex of the catalyst chloroplatinic acid should not be too much, which is subject to the convenience of operation. Otherwise, the viscosity increase is not conducive to the operation; when the amount of the catalyst is insufficient, the vulcanization is incomplete, the surface of the foam is sticky, and the elasticity is not Good, soft and plastic, with poor strength.

The foamed silicone rubber is liquid before vulcanization and is suitable as a potting material. The vulcanized foam can be used for a long time at -60~159 °C, aged at 150 ° C, 72 hours, or 10 times from 60 to 10 70 ° C. The foam still maintains its original properties. Foamed silicone rubber is an ideal lightweight packaging material because of its high thermal stability, good thermal insulation, insulation, moisture resistance, and shock resistance, especially at high frequencies. Used for "three defenses" protection. In addition, it can also be used as a filling material for the insulating interlayer and a floating material and a sealing material in a salt spray atmosphere. Foam silicone rubber can also be used as a filling, repairing and dressing material for orthopedics in medicine. In order to apply the fire protection requirements of transmission lines, the United States Anti-Corning Company developed a flame retardant room temperature vulcanized foamed silicone rubber DC3-6548. This kind of foamed silicone rubber is mainly used for fireproof sealing of wires and cables (such as holes in roofs, walls, buildings, etc.), and its flame retardant performance is very good. Its limiting oxygen index is 39 (the limit oxygen index of most plastics is only 20). ), the service life is up to 50 years. At present, such flame-retardant room temperature vulcanized foamed silicone rubber has been widely used in places with severe environmental conditions such as nuclear power plants, electronic computer centers, offshore oil production facilities, or particularly high fire protection requirements.