Silicone rubber polymer molecules are chain like structures connected by Si-O (silicon oxygen) bonds, mainly composed of high molar mass linear polydimethylsiloxane. Due to the Si-O-Si bond being the basic bond type, silicon atoms mainly connect to methyl groups, and a very small amount of unsaturated groups are introduced on the side chains. The intermolecular forces are small, and the molecules have a helical structure. The methyl groups are arranged outward and can rotate freely, making silicone rubber have better heat resistance, electrical insulation, chemical stability, etc. than other ordinary rubbers. A typical silicone rubber, namely polydimethylsiloxane, has a helical molecular configuration with low intermolecular forces, thus possessing good resilience. At the same time, formaldehyde groups pointing out of the helix can rotate freely, giving silicone rubber unique surface properties such as hydrophobicity and surface anti adhesion.

Heat resistance: Silicone rubber has much better heat resistance than ordinary rubber and can be used almost forever at 150 degrees without any performance changes; Can be used continuously for 10000 hours at 200 degrees Celsius; It can also be used for a period of time at 350 degrees. Widely used in occasions requiring heat resistance: sealing rings for hot water bottles, heat-resistant handles for pressure cooker rings

Cold resistance: Ordinary rubber has a delay of -20 ° C to -30 ° C, while silicone rubber still has good elasticity at -60 ° C to -70 ° C. Some special formulations of silicone rubber 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. Moreover, under prolonged exposure to ultraviolet radiation and other climatic conditions, its physical properties only undergo minor changes. Sealing materials for outdoor use
Electrical performance: Silicone rubber has high electrical resistivity and its resistance remains stable over a wide range of temperatures and frequencies. 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 conductive fillers (such as carbon black) are added, silicone rubber has keyboard conductive contact points

Thermal conductivity: When certain thermal conductive fillers are added, silicone rubber has thermal conductivity, heat dissipation fins, thermal seals, copiers, fax machines, and thermal rollers

Radiation resistance: The radiation resistance of silicone rubber containing phenyl groups greatly improves the electrical insulation of cables and connectors used in nuclear power plants

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 gases when burned.

Breathability: Silicone rubber film has better breathability than ordinary rubber and plastic wax film. Another characteristic is its strong selectivity towards different air permeability rates. Gas exchange membrane medical supplies, artificial organs

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