Silicone sealing ring is a kind of sealing ring. It is made of various silica gel and used to fix the annular cover so that it can match the gap between the ferrule or gasket on the bearing. It is different from the sealing ring made of other materials. The performance of water resistance or leakage is even better. At present, it is mainly used for waterproof sealing and preservation of daily necessities such as crisper, rice cooker, water dispenser, lunch box, magnetized cup, coffee pot, etc. It is easy to use, safe and environmentally friendly, and is deeply loved by everyone. So today, let's take a deeper look at the silicone sealing ring.
The difference between the silicone sealing ring and other material sealing rings:
1. Excellent weather resistance
Weather resistance refers to a series of aging phenomena such as fading, discoloration, cracking, chalking and strength loss due to the influence of external conditions such as direct sunlight and temperature changes. Ultraviolet radiation is the main factor that promotes product aging. 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, even if it is used outdoors for a long time, it will not crack.
2. Material safety and environmental protection
Silicone rubber has its unique physiological inertness, non-toxic and tasteless, no yellowing and no fading after long-term use, and is less disturbed by the external environment. It meets the national food and medical hygiene standards. It is mostly used in food, medicine, aluminum silver paste and various oils. class filter impurity on.
3. Good electrical insulation performance
Silicone silicone has excellent electrical insulation properties, and is also very good in corona resistance (the ability to resist quality degradation) and arc resistance (the ability to resist deterioration caused by high-voltage arc action).
4. High air permeability and selectivity to gas transmission
Due to the molecular structure of silica gel, the silica gel sealing ring has good gas permeability and good selectivity to gases. At room temperature, the gas permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide and other gases is 30-50 times higher than that of natural rubber. times.
5. Hygroscopicity
The surface energy of the silicone ring is low, which has the function of absorbing and insulating the moisture in the environment.
6. Wide range of high and low temperature resistance
(1). High temperature resistance: Compared with ordinary rubber, the sealing ring made of silica gel has better heat resistance, and can be heated at high temperature without deformation and without producing harmful substances. It can be used almost forever at 150°C without performance change, can be used continuously at 200°C for 10,000 hours, and can be used at 350°C for a period of time. Widely used in occasions that require heat resistance, such as: thermos bottle sealing ring.
(2). Low temperature resistance: Ordinary rubber will become hardened and brittle at -20°C to -30°C, while silicone rubber still has good elasticity at -60°C to -70°C. Some specially formulated silicone rubber It can also withstand more severe extremely low temperatures, such as: cryogenic sealing rings, the lowest can reach -100°C.
Disadvantages of silicone rubber seals:
(1). The mechanical properties of tensile strength and tear strength are poor. It is not recommended to use silicone sealing rings for stretching, tearing, and strong wear in the working environment. Usually, it is only used for static sealing.
(2). Although silicone rubber is compatible with most oils, compounds and solvents, and has good acid and alkali resistance, it has no resistance to alkyl hydrogen and aromatic oils. Therefore, it is not suitable for use in environments where the working pressure exceeds 50 pounds. In addition, it is not recommended to use silicone seals in most concentrated solvents, oils, concentrated acids and diluted caustic soda solutions.
(3). In terms of price, compared with other materials, the manufacturing cost of silicone sealing rubber ring is relatively high.
Post time: Feb-07-2023
