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Thermal vulcanized silicone rubber form

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The hot vulcanized silicone rubber is sold in the form of raw rubber or vulcanizate, and is generally prepared into rubber compounds with various characteristics for users to choose. According to different characteristics, it can be divided into the following categories:

(1) Universal type (general strength type). It is composed of vinyl silicone rubber and reinforcing agent. The physical properties of vulcanizate are medium. It is a kind of compound with the largest amount and the strongest versatility.
(2) High strength type. Vinyl silicone rubber or low phenyl silicone rubber shall be used. Vapor phase white carbon black with large specific surface area or modified white carbon black shall be used as reinforcing agent, and comprehensive improvement measures such as adding appropriate processing aids and special additives shall be taken to improve the cross-linking structure and tear strength.
(3) High temperature resistant type. Silicone rubber with high temperature resistance of 300~350 ℃ can be prepared by using vinyl silicone rubber or low phenyl silicone rubber, the type of reinforcing agent and heat resistant additive.
(4) Low temperature type. The low phenyl silicone rubber is used. The brittleness temperature reaches - 120 ℃, and it still has elasticity at - 90 ℃.
(5) Low compression permanent deformation type. Vinyl silicone rubber is mainly used, and the special organic peroxide of vinyl is used as the curing agent. When the compression ratio is 30%, the permanent deformation after 24~72h compression at 150 ℃ is 7.0%~15% (20%~30% for ordinary silicone rubber).
(6) Wire and cable type. It mainly adopts vinyl silicone rubber, and uses fumed silica with good electrical insulation performance as the reinforcing agent, which has good extrusion process performance.
(7) Oil and solvent resistant. Ammonia silicone rubber is mainly used, which is generally divided into two categories: general purpose type and high-strength type.
(8) Flame retardant. The compound made of vinyl silicone rubber and halogen or platinum compounds as flame retardant has good flame resistance.
(9) Conductive type. Silicone rubber with volume resistivity of 2.0 ~ 100 Ω· cm can be obtained by using vinyl silicone rubber, acetylene carbon black or metal powder as filler, and high temperature vulcanization or addition vulcanization.
(10) Heat shrinkable. When thermoplastic materials with certain melting temperature or softening temperature are added to vinyl silicone rubber, the thermal shrinkage of silicone rubber compound can reach 35%~50%.

For silica gel, please check the details:https://www.rtvsilicone.net/product-industrial-grade-for-extruded-silicone-rubber-iota-sh-1235a/b-.html

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