Silicone rubber refers to a rubber whose main chain is composed of alternating silicon and oxygen atoms, with two organic groups usually attached to the silicon atom. Ordinary silicone rubber is mainly composed of silicone chains containing methyl and a small amount of vinyl groups. The introduction of phenyl groups can improve the high and low temperature resistance of silicone rubber, while the introduction of trifluoromethyl and cyano groups can improve the temperature and oil resistance of silicone rubber. Silicone rubber has good low-temperature resistance and can generally work at -55 ℃. After introducing phenyl, it can reach -73 ℃. The heat resistance of silicone rubber is also outstanding. It can work for a long time at 180 ℃, and can withstand several weeks or longer with elasticity even slightly above 200 ℃. It can instantly withstand high temperatures above 300 ℃. Silicone rubber has good breathability and the highest oxygen permeability among synthetic polymers. In addition, silicone rubber has outstanding characteristics of physiological inertness and does not cause coagulation, so it is widely used in the medical field.

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