Silicone rubber refers to the main chain is alternately composed of silicon and oxygen atoms, silicon atoms are usually connected with two organic groups of rubber, silicone rubber can be divided into machine silicone and inorganic silicone two categories. It has excellent heat resistance, cold resistance, weather resistance and other characteristics, its main uses are insulation, moisture proof, sealing, bonding, anti-vibration and so on.

Silicone rubber composition

It is mainly divided into bai silicone base adhesive, silica, du calcium carbonate, curing agent, etc., hot vulcanization type (high temperature vulcanization silica gel HTV), room temperature vulcanization type (daoRTV), of which room temperature vulcanization type is also polycondensation reaction type and addition reaction type.

Characteristics and uses of silicone rubber

1, heat resistance: the heat resistance of silicone rubber is very prominent, can work for a long time at 180 ° C, slightly above 200 ° C can also withstand a few weeks or longer is still elastic, instantaneous resistance to high temperatures above 300 ° C. Widely used in applications requiring heat resistance: hot water bottle sealing ring, pressure cooker ring heat resistant handle

2, cold resistance: ordinary rubber delay is -20 degrees ~ -30 degrees, that is, silicone rubber still has good elasticity when it is -60 degrees ~ -70 degrees, and some special formulas of silicone rubber can also withstand extremely low temperature, suitable for low temperature sealing rings.

3, weather resistance: ordinary rubber rapidly degrades under the action of ozone generated by corona discharge, while silicone rubber is not affected by ozone. And for a long time under ultraviolet light and other climatic conditions, its physical properties are only slightly changed, and it is used as a sealing material for outdoor use.

4, electrical properties: silicone rubber has a high resistivity and its resistance remains stable in a wide temperature and frequency range. At the same time, silicone rubber has good resistance to high voltage corona discharge and arc discharge. High voltage insulators, TV high voltage caps, electrical parts, other.

5, electrical conductivity: when adding conductive filler (such as carbon black), silicone rubber has a keyboard conductive contact point.

6, thermal conductivity: when adding some thermal conductivity filler, silicone rubber has thermal conductivity, used for heat sink, thermal sealing gasket, photocopier, fax machine thermal roll.

7, radiation: containing phenyl silicone rubber radiation resistance greatly improved, electrical insulation cable, used in nuclear power plant connectors.

8, flame retardant: silicone rubber itself is flammable, but when adding a small amount of flame retardant agent, it has flame retardant and self-extinguishing; And because silicone rubber does not contain organic halides, it does not smoke or emit harmful gases when burning.

9. Permeability: silicone rubber film has better permeability than ordinary rubber and plastic waxing film. Another feature is that it has a strong selectivity for different air permeability. Therefore, it is widely used in the medical industry.