The compounding agent of hot vulcanized silicone rubber mainly includes reinforcing agent, vulcanizing agent and some special auxiliaries. Generally, only 5 to 6 components are needed to form a practical formula.

The formulation design should consider the following points:

(1) Silicone rubber is a raw rubber with high saturation, and usually cannot be vulcanized with sulfur. Organic peroxides should be used as vulcanizing agents, so the rubber compound must not contain active substances (such as grooves) that can interact with peroxide decomposition products. Process carbon black, some organic accelerators and antioxidants, etc.), otherwise it will affect the vulcanization.

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

(3) Silicone rubber can easily cause cleavage and rearrangement of siloxane bonds under the action of chemical reagents such as a small amount of acid or alkali, resulting in the reduction of heat resistance of silicone rubber. Therefore, the acidity and alkalinity of the compounding agent and the acidity of the peroxide decomposition product must be considered when selecting the compounding agent, so as not to affect the performance of the vulcanizate.