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中文简体Silicone materials have been widely used in various industries in recent years, and products made of silicone materials can be seen in food hygiene, industrial equipment, etc. Such as silicone seals. So what are the differences between silicone sealing rings and seals made of other materials?
1. Excellent weather resistance
Weather resistance refers to a series of aging phenomena such as fading, discoloration, cracking, chalking, and strength reduction due to the influence of direct sunlight, temperature changes, wind and rain, and other external conditions. main factor. The Si-O-Si bond in silicone rubber is very stable to oxygen, ozone, and ultraviolet rays, and has excellent resistance to the erosion of ozone and oxides. Without any additives, it has excellent weather resistance and does not crack even if it is used outdoors for a long time. It is generally believed that silicone rubber seals can be used outdoors for more than 20 years.
2. Material safety and environmental protection
Silicone rubber has its unique physiological inertia, non-toxic, tasteless, odorless, good preservation effect, and less disturbed by the external environment, and it will not yellow or fade after long-term use. And it meets the national food and medical hygiene standards and is mostly used in food, medicine, aluminum and silver paste, and various oils to filter and remove impurities.
3. Good electrical insulation performance
Silicone has excellent electrical insulating properties, and corona resistance (the property that resists quality degradation) and arc resistance (the ability to resist deterioration caused by the action of a high-voltage arc) are also very good.
4. High gas permeability and selectivity to gas permeation
Due to the molecular structure of silicone, the silicone sealing ring has good air permeability and good selectivity for gases. The air permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide, and other gases at room temperature is 30-50 higher than that of natural rubber. times.
5. Has hygroscopic properties
The surface energy of the silicone ring is low, and it has the function of absorbing and isolating moisture in the environment.
6. Wide range of high and low-temperature resistance
High-temperature resistance: Compared with ordinary rubber, the sealing ring made of silicone has better heat resistance, and can be heated at high temperatures without deformation and with no harmful substances. It can be used almost forever without performance change at 150℃, can be used continuously for 10,000 hours at 200℃, and can also be used for a period of time at 350℃. Widely used in occasions requiring heat resistance, such as thermos seals.
Low-temperature resistance: ordinary rubber will become hardened and brittle at -20℃～-30℃, while silicone rubber still has good elasticity at -60℃～-70℃. Withstand more severe extremely low temperatures, such as low-temperature sealing ring, the lowest can reach -100 ℃.
7. High gas permeability and selectivity to gas permeation
Due to the molecular structure of silicone, the silicone sealing ring has good air permeability and good selectivity for gases. The air permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide, and other gases at room temperature is 30-50 higher than that of natural rubber. times.
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