Silicone rubber seal ring has excellent heat resistance, low-temperature elasticity, excellent oxidation resistance and ozone resistance. Silicone rubber seal ring has high permeability and selectivity. Good electrical insulation performance (volume resistance greater than 10 Ω). Cm, breakdown voltage above 30KV/mm), corona resistant and arc resistant. However, proper conductivity can be obtained by adding conductive carbon black, nickel powder, aluminum powder and silver powder (the volume resistance can reach 5-0.02 Ω). Cm). Silicone sealing ring has low surface energy and moisture absorption, and can be used as isolation material.

Water resistance, but poor water vapor resistance, pressure higher than 50psi is not recommended. Compatible with most oils, chemicals and solvents. Generally speaking, silicone rubber has good acid and alkali resistance, good resistance to polar solvents, but not to alkane hydrogen and aromatic oils. It is not recommended to use in most concentrated solvents, petroleum products, concentrated acids and dilute caustic soda solutions. Special silicone rubber also has radiation resistance, fire resistance, oil resistance and other properties. Silicone rubber seal ring has low tensile strength and poor wear resistance, and is generally not used for dynamic sealing.

The polymer molecule of silicone seal ring is a chain structure formed by silicon oxygen bond, and its main component is high molecular weight linear polysiloxane. Because the Si-O-Si bond is a basic bond type, the silicon atom is mainly connected with methyl group, and a small amount of unsaturated groups are introduced into the side chain. The intermolecular force is small, and the molecules are helical. The methyl group is arranged outward and can rotate freely, so that the silicone rubber seal ring has better heat resistance, electrical insulation and chemical stability than other ordinary rubber.The typical silicone sealing ring is polydimethylmethylene.

Siloxane has a helical molecular structure, small intermolecular force and good elasticity. At the same time, the formaldehyde radical outside the screw can rotate freely. Therefore, the silicone sealing ring has unique surface properties, such as hydrophobicity and surface anti adhesion
The main component of silicone seal ring is silicone. The main molecular chain of silica gel is composed of silicon atoms and oxygen atoms alternately. It is a polymer elastic material with both inorganic and organic properties. At present, the most widely used is methyl vinyl silicone rubber, which is composed of dimethylsiloxane and a small amount of vinyl siloxane.

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