(1) High and low temperature resistance
Among all rubbers, silicone rubber has the widest working temperature range (- 100~350 ℃). For example, properly matched vinyl silicone rubber or low phenyl silicone rubber can still retain elasticity after being aged for thousands of hours at 250 ℃ or hundreds of hours at 300 ℃ in hot air; The low phenyl silicone rubber vulcanizate can remain elastic after being aged for tens of hours at 350 ℃ in hot air. Its glass transition temperature is - 140 ℃, and its vulcanizate is still elastic at - 70~100 ℃. When silicone rubber is used as the thermal protective coating on the inner wall of the rocket nozzle, it can withstand thousands of degrees of high temperature instantaneously.

(2) Ozone aging resistance, oxygen aging resistance, light aging resistance and weather aging resistance
The performance of silicone rubber vulcanizate has no significant change after being exposed to outdoor sun for several years under free state.

(3) Electrical insulation performance
The electrical insulation performance of silicone rubber vulcanizate changes little when affected with moisture, frequency change or temperature rise, and the silicon dioxide generated after combustion is still an insulator. In addition, there are few carbon atoms in the molecular structure of silicone rubber, and carbon black is not used as filler, so it is not easy to scorch during arc discharge, and it is very reliable in high-voltage applications. Its corona resistance and arc resistance are excellent. Its corona resistance life is 1000 times that of PTFE and arc resistance life is 20 times that of fluororubber.

(4) Special surface properties and physiological inertia
The surface energy of silicone rubber is smaller than that of most organic materials, and it has low moisture absorption. The water absorption rate after long-term immersion in water is only about 1%. Its physical properties do not decline, and its mildew resistance is good. It does not bond with many materials, and it can play an isolation role. Silicone rubber is tasteless, non-toxic, has no adverse effect on human body, has slight reaction with body tissues, and has excellent physiological inertia and physiological aging.

(5) High permeability
Compared with other polymer materials, silicone rubber has good air permeability. The permeability of nitrogen, oxygen and air at room temperature is 30-40 times higher than NR; It is selective for gas permeation, for example, the permeability of carbon dioxide is about 5 times that of oxygen.

(6) Biomedical performance
The characteristics of the molecular structure of silicone rubber make it have excellent biomedical properties, which has been proved by the successful application of a large number of animal and human experiments.

For silicone rubber, please check the details:
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