Compared with general general-purpose rubber, the combination components of all three major types of silicone rubber are relatively simple, and the same applies to hot vulcanized types. In addition to raw rubber, compounding agents mainly include reinforcing agents, vulcanizing agents, and certain special additives. Generally, only 5-6 components are needed to form a practical formula. The design of silicone rubber formula should consider the following points.

(1) Silicone rubber is a highly saturated raw rubber that cannot be vulcanized with sulfur and is typically vulcanized using heat. Hot vulcanization uses organic peroxides as vulcanizing agents, so the rubber compound must not contain active substances that can react with the decomposition products of peroxides, otherwise it will affect vulcanization.

(2) Silicone rubber products are generally used at high temperatures, and their compounding agents should remain stable at high temperatures. Therefore, inorganic oxides are usually used as reinforcing agents.

(3) Silicone rubber is prone to cracking and rearrangement of siloxane bonds under the action of trace amounts of polar chemical reagents such as acids or bases, leading to a decrease in the heat resistance of silicone rubber Therefore, when selecting compounding agents, their acidity and alkalinity must be taken into account, as well as the acidity of peroxide decomposition products, in order to avoid affecting the performance of the vulcanized rubber.

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