Silicone rubber refers to the main chain is alternately composed of silicon and oxygen atoms, silicon atoms are usually connected with two organic groups of rubber. Ordinary silicone rubber is mainly composed of silicone chains containing methyl groups and a small amount of vinyl. The introduction of phenyl group can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyanide group can improve the temperature resistance and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance and can generally work at -55 ° C. After the introduction of phenyl, it can reach -73℃. The heat resistance of silicone rubber is also very prominent, can work for a long time at 180 ° C, slightly higher than 200 ° C can also withstand a few weeks or longer is still elastic, instantaneous resistance to high temperatures above 300 ° C. The gas permeability of silicone rubber is good, and the oxygen permeability is the highest in the synthetic polymer. In addition, silicone rubber also has the outstanding characteristics of physiological inertia and does not cause coagulation, so it is widely used in the medical field.

Silicone rubber thermal vulcanization type (high temperature vulcanized silica gel HTV), room temperature vulcanization type (RTV), of which room temperature vulcanization type is also polycondensation reaction type and addition reaction type. High temperature silicone rubber is mainly used in the manufacture of various silicone rubber products, while room temperature silicone rubber is mainly used as a bonding agent, potting material or mold. The amount of hot vulcanization type is the largest, and the hot vulcanization type is divided into methyl silicone rubber (MQ), methyl vinyl silicone rubber (VMQ, the amount and product grade are the most), methyl vinyl phenyl silicone rubber PVMQ(low temperature resistance, radiation resistance), and other rubber, fluorine silicone rubber.