The compounding agent of hot-vulcanized silicone rubber mainly includes reinforcing agent, vulcanizing agent and some special additives. Generally, it only needs 5-6 components to form a practical formula.

The formula design should consider the following points:
(1) Silicone rubber is a raw rubber with high saturation. Generally, sulfur cannot be vulcanized. Organic peroxides should be used as the vulcanizing agent. French carbon black, certain organic accelerators and antioxidants, etc.), otherwise it will affect 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 is prone to cleavage and rearrangement of siloxane bonds under the action of chemical reagents such as a small amount of acid or alkali, resulting in a decrease in the heat resistance of silicone rubber. Therefore, the acidity and alkalinity of the compounding agent and the acidity of peroxide decomposition products must be considered when selecting the compounding agent, so as not to affect the performance of the vulcanizate.