1. Characteristics of silicone:
Excellent low and high temperature resistance, non-conductivity and particularly excellent resistance to oxidation and ozone. Compatible with most oils and solvents. Tasteless, odorless, non-toxic. FDA approved materials for food processing. But its pull Low tensile strength, not wear-resistant, generally not used for dynamic sealing. Temperature range: -60 ~ 225 degrees, a special point can reach 300 degrees (borosilicate rubber can reach 450 degrees).
2. Classification of silicone:
According to the reinforcing filler used, there are: gas-phase glue (using gas-phase method white carbon black) and precipitation glue (using precipitation method white carbon black)
According to the type of side chain: methyl silicone rubber, methyl vinyl silicone rubber, benzyl silicone rubber, etc.
According to the vulcanization conditions: room temperature vulcanized silicone rubber, high temperature vulcanized silicone rubber, etc.
3. Name: Many people use the abbreviation of E for silicone rubber as VMQ. In fact, as far as I know, the abbreviation of E for silicone should be Q, and VMQ is the most used one in silicone-methyl vinyl silicone Rubber, MQ is methyl silicone rubber. FVMQ is fluorosilicone rubber.
4. Silica gel vulcanizing agent: Unlike many rubbers, silica gel is a saturated rubber, so its vulcanizing agent is a bit different from many rubbers, can not use sulfur vulcanization system. The commonly used vulcanizing agent is peroxide, the general use is double 2.5 Or double 2.4 depends on the vulcanization process.