Performance characteristics of silicone rubber
Release time:
2025-05-12
High and low temperature resistance: The working temperature range of silicone rubber is extremely wide, and it can maintain elasticity and stability between -100 ℃ and 350 ℃. For example, properly matched vinyl silicone rubber or low phenyl silicone rubber can still maintain elasticity after thousands of hours at 250 ℃ or hundreds of hours at 300 ℃. Low phenyl silicone rubber vulcanizate can still maintain elasticity after tens of hours of hot air aging at 350 ℃. Its glass transition temperature is -140 ℃, and the vulcanizate still has elasticity at a temperature of -70 ℃ to 100 ℃.
High and low temperature resistance: The working temperature range of silicone rubber is extremely wide, and it can maintain elasticity and stability between -100 ℃ and 350 ℃. For example, properly matched vinyl silicone rubber or low phenyl silicone rubber can still maintain elasticity after thousands of hours at 250 ℃ or hundreds of hours at 300 ℃. Low phenyl silicone rubber vulcanizate can still maintain elasticity after tens of hours of hot air aging at 350 ℃. Its glass transition temperature is -140 ℃, and the vulcanizate still has elasticity at a temperature of -70 ℃ to 100 ℃.
Good electrical insulation performance: silicone rubber vulcanizate has excellent electrical insulation performance, and changes little when it is affected with moisture, frequency change or temperature rise, and the silicon dioxide generated after combustion is still an insulator. In addition, its molecular structure less carbon atoms, and do not use carbon black as a filler, in the arc discharge is not easy to scorch, in high pressure occasions to use very reliable, corona life is 1000 times that of polytetrafluoroethylene, arc life is 20 times that of fluorine rubber.
Good weather resistance: silicone rubber vulcanizate in the free state placed in the outdoor exposure after several years, no significant change in performance, with excellent resistance to ozone aging, oxygen aging, light aging and weathering resistance.
Excellent surface properties and physiological inertness: silicone rubber surface energy is smaller than most organic materials, with low hygroscopicity, long-term immersion in water absorption rate is only about 1%, physical properties do not decline, good mildew resistance, and many materials do not occur adhesion, can play a role in isolation. At the same time, it is tasteless, non-toxic, no adverse effects on the human body, and the body tissue reaction is slight, with excellent physiological inertia and physiological aging.
High air permeability: compared with other polymer materials, silicone rubber has good air permeability. At room temperature, the permeability of nitrogen, oxygen and air is 30 - 40 times higher than that of natural rubber, and it is selective to gas permeability, such as carbon dioxide permeability is about 5 times that of oxygen.
Good biomedical properties: The molecular structure of silicone rubber makes it have excellent biomedical properties, which has been proved by the successful application of a large number of animal and human trials.
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