The silicone rubber polymer molecule is a chain structure formed by Si-O (silicon-oxygen) bonds, and its main composition is linear polysiloxane with high molar mass. Since the Si-O-Si bond is the basic bond type, the silicon atom is mainly connected to the methyl group, and a very small amount of unsaturated groups is introduced into the side chain, the intermolecular force is small, the molecule is in a helical structure, and the methyl group faces outward Arranged and can rotate freely, making silicone rubber better than other ordinary rubbers in heat resistance, electrical insulation, chemical stability, etc. A typical silicone rubber, namely polydioxymethylene siloxane, has a helical molecular configuration, and its intermolecular force is small, so it has good resilience. At the same time, the formaldehyde group pointing out of the helix can rotate freely, thus making silicone rubber. Has unique surface properties, such as hydrophobicity and surface anti-sticking.

Heat resistance: Silicone rubber has much better heat resistance than ordinary rubber, and can be used almost forever at 150 degrees without performance changes; it can be used continuously for 10,000 hours at 200 degrees; it can also be used at 350 degrees Use for a while. Widely used in occasions requiring heat resistance: thermos seal ring, pressure cooker ring heat-resistant handle

Cold resistance: ordinary rubber is delayed at -20 degrees to -30 degrees, that is, silicone rubber still has good elasticity at -60 degrees to -70 degrees, and some specially formulated silicone rubbers can also withstand extremely low temperatures.

Weather resistance: Ordinary rubber degrades rapidly under the action of ozone generated by corona discharge, while silicone rubber is not affected by ozone. And under ultraviolet light and other climatic conditions for a long time, its physical properties only change slightly. Sealing materials for outdoor use

Electrical properties: Silicone rubber has high resistivity and its resistance remains stable in a wide range of temperature and frequency. 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 components, etc.

Conductivity: When a conductive filler (such as carbon black) is added, the silicone rubber has conductive contact points for the keyboard

Thermal conductivity: when some thermally conductive fillers are added, the silicone rubber has thermal conductivity

Radiation: The radiation resistance of silicone rubber containing phenyl is greatly improved. Electrically insulated cables, connectors for nuclear power plants, etc.

Flame retardancy: Silicone rubber itself is flammable, but when a small amount of flame retardant is added, it has flame retardancy and self-extinguishing properties; and because silicone rubber does not contain organic halides, it does not emit smoke or toxic gas when burning

Air permeability: Silicone rubber film has better air permeability than ordinary rubber and plastic wax film. Another feature is its strong selectivity for different air permeability. Gas exchange membrane medical supplies, artificial organs.