Custom Heat Resistant Silicone Seals Gaskets

The silicone gasket is a saturated non-polar rubber formed on the basis of silicon element obtained from quartz and adhered to a side chain such as a methyl group or a vinyl group by a silicon atom. Different side chains can cause silicone rubber to have different characteristics. Methyl vinyl silicone rubber (VMQ) is a silicone rubber material that is widely used.

1.Characteristics

The silicone seal has excellent heat resistance, low temperature elasticity and particularly excellent oxidation and ozone resistance, and has high gas permeability and selectivity for gas permeation. Good electrical insulation properties (volume resistance greater than 10 ohm.cm, breakdown voltage above 30kv/mm), corona resistance and arc resistance. However, the addition of conductive carbon black, nickel powder, aluminum powder, silver powder, and the appropriate conductivity (volume resistance can be 5-0.02 ohm.cm). The silicone ring has a low surface energy, is hygroscopic, and acts as a barrier. Water resistant, but poor water vapor resistance, pressure above 50 psi is not recommended. Compatible with most oils, chemicals and solvents. Generally, silicone rubber has good acid and alkali resistance, is resistant to polar solvents, and is not resistant to alkane hydrogen and aromatic oils. Not recommended for use in most concentrated solvents, oils, concentrated acids and diluted caustic soda solutions. Special silicone rubber also has radiation, fire and oil resistance. It has low tensile strength and weak abrasion resistance and is generally not used for dynamic sealing.

Heat resistance: Silicone rubber has much better heat resistance than ordinary rubber. It can be used almost forever at 150° without performance change. It can be used continuously for 10,000 hours at 200° and for a period of time at 350°. . Widely used in applications requiring heat resistance, hot water bottle seals, pressure cooker ring heat-resistant handles.

Cold resistance: ordinary rubber is late for -20°-30°, that is, silicone rubber still has good elasticity at -60°-70°, and some special formula silicone rubber can withstand extremely low temperature, such as: low temperature. Sealing ring.

2.Temperature Range

-60 ° C ~ 225 ° C, special silicone rubber high temperature up to 300 ° C, and low temperature can be -100 ° C. (TR10 can be used at -100 ° C)

3.Hardness range

Shore A 25 degrees to 90 degrees.