Silicone rubber has many advantages and properties. Different properties have their own effects. What are the properties of silicone rubber?
1. High and low temperature resistance Among all rubbers, silicone rubber has the widest operating temperature range (-100~350℃). For example, properly blended vinyl silicone rubber or low phenyl silicone rubber can still maintain elasticity after hot air aging at 250°C for thousands of hours or 300°C for hundreds of hours; low phenyl silicone rubber vulcanized rubber can survive dozens of hours at 350°C. It can still maintain elasticity after being aged in hot air for 1 hour. Its glass transition temperature is -140°C, and its vulcanized rubber is still elastic at temperatures of -70 to 100°C. When silicone rubber is used as a heat-proof coating on the inner wall of a rocket nozzle, it can withstand instantaneous high temperatures of thousands of degrees. Silicone rubber has a continuous service life under high temperatures.

2. Resistance to ozone aging, oxygen aging, light aging and weathering aging. There is no significant change in the performance of silicone rubber vulcanized rubber after being exposed to the sun outdoors for several years in a free state. Comparison of ozone aging resistance between silicone rubber and other rubbers.

3. Electrical insulation performance: The electrical insulation performance of silicone rubber vulcanizate changes little when affected by moisture, frequency changes or temperature increases. The silica produced after combustion is still an insulator. In addition, silicone rubber has few carbon atoms in its molecular structure and does not use carbon black as a filler. Therefore, it is not prone to scorch during arc discharge and is very reliable in high-voltage applications. Its corona resistance and arc resistance are excellent, its corona resistance life is 1,000 times that of polytetrafluoroethylene, and its arc resistance life is 20 times that of fluororubber.

4. Special surface properties and physiological inertness. The surface energy of silicone rubber is smaller than that of most organic materials. It has low hygroscopicity. The water absorption rate is only about 1% when immersed in water for a long time. The physical function does not decrease. It has good anti-mildew function and is compatible with many The material does not bond and can play an isolation role. Silicone rubber is odorless, non-toxic, has no adverse effects on the human body, reacts slightly with body tissues, and has excellent physiological inertness and physiological aging properties.

5. Highly breathable silicone rubber has good air permeability compared with other polymer materials. The permeability of nitrogen, oxygen and air at room temperature is 30 to 40 times higher than that of NR; it is selective for gas permeation and leakage, such as The permeability of carbon dioxide is about 5 times that of oxygen.

6. Biomedical function The molecular structure characteristics of silicone rubber enable it to have excellent biomedical functions. This has been confirmed by the successful application of a large number of animal and human experiments.