? Silicon element silicone ring is obtained from quartz-based, such as by adhesion to silicon atoms, a vinyl side chain to form a saturated non-polar rubber. Can cause different side chains of silicone rubber having different characteristics. Vinyl silicone rubber (VMQ) is the application of more of a silicone rubber material. Silicone ring has excellent heat resistance, particularly excellent flexibility and resistance to oxidation and ozone low temperatures, with high selectivity and permeability to gas permeation. Good electrical insulation properties (volume resistivity greater than 10 European .cm, the breakdown voltage of 30kv / mm or more), corona resistance and arc resistance. But with the addition of conductive carbon black, nickel powder, aluminum powder, silver powder, but also to give the appropriate conductivity (volume resistivity of up to 5-0.02 European .cm). Silicone ring surface energy lower hygroscopic, can play a role in isolation. Water, but poor resistance to water vapor pressure over 50psi or more is not recommended. And a solvent compatible with most of the oil, chemicals. General Silastic acid resistance, resistance to polar solvents can still be intolerant of hydrogen and alkyl aromatic oils. Not recommended for use in the most concentrated caustic soda solution, solvent, oil, concentrated acid and the diluted. Special silicone rubber is also resistant to radiation, fire, oil and other properties. Its low tensile strength, wear resistance is weak, generally not used for dynamic sealing.