The chemical composition of silicone rubber is silicon-oxygen. Silicone rubber refers to a rubber that is composed of silicon and oxygen atoms in the main chain. Two organic groups are usually attached to the silicon atom. Ordinary silicone rubber is mainly composed of methyl and a small amount of ethylene. The introduction of phenyl groups can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyano groups can improve the temperature and oil resistance of silicone rubber.

Silicone rubber has excellent low-temperature resistance, and it can generally work at -55°C. After the introduction of phenyl, the temperature can reach -73℃. Silicone rubber also has outstanding heat resistance. It can be operated for a long time at 180°C, and can withstand a few weeks or longer when it is slightly higher than 200°C, and it can withstand high temperatures above 300°C instantaneously.

Silica gel is a kind of silicone rubber. It is classified as a one-component room temperature vulcanized liquid rubber. Once exposed to the air, the silane monomers in it will condense to form a network structure. The system is cross-linked. It cannot be melted or dissolved. It is elastic. In a rubbery state, bonding objects together. Its thermal conductivity is slightly higher than that of ordinary rubber. Once cured, it is difficult to separate the bonded objects. According to some chemistry books, "silica gel" should be a condensate of silica, which is classified as an amorphous substance. Insoluble water and any solvents are non-toxic, tasteless, chemically stable, and do not react with any substances except strong alkalis and hydrofluoric acid.