Silicone sealing ring is a kind of sealing ring, which is made of various silica gel as raw materials for fixing the ring cover, so that it can be fitted with the gap between the ring or the washer on the bearing, and the sealing ring made of other materials has more excellent performance in preventing water or oil leakage. At present, it is mainly used for waterproof sealing and preservation of daily supplies such as fresh-keeping box, rice cooker, drinking machine, lunch box, insulated box, fresh-keeping box, water cup, oven, magnetized cup, coffee pot, etc. It is convenient to use, safe and environmental protection, and is deeply loved by everyone.
So today, let’s take a look at the silicone sealing ring.
1.Excellent weather resistance
Weather resistance refers to the influence of direct sunlight, temperature changes, wind and rain and other external conditions, and a series of aging phenomena such as fading, discoloration, cracking, powder and strength decline, ultraviolet irradiation is the main factor to promote the aging of products. Si-O-Si bond in silicone rubber is very stable to oxygen, ozone and ultraviolet rays, and has excellent resistance to ozone and oxide erosion. In the absence of 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, no smell, good preservation effect, and less interference by the external environment, long-term use unchanged yellow, do not fade. And in line with the national food and medical health standards, mostly used in food, medicine, aluminum silver pulp and various oils filtration and impurity removal.
3.Good electrical insulation performance
Organic silicone has excellent electrical insulation properties, corona resistance (can resist quality declination) and arc resistance (resistance to deterioration caused by high voltage arc action) is also very good.
4.High permeability and selectivity of gas transmission
Because the molecular structure of silica gel makes the silicone sealing ring have good permeability and good selectivity for gas, the permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide and other gases at room temperature is 30-50 times higher than that of natural rubber.
5.Hygroscopic performance
The surface energy of the silica gel ring is low, which has the absorption function of water in the environment and plays the role of isolation.
6.Wide range of high and low temperature resistance
High temperature resistance: silicone sealing ring compared with ordinary rubber has better heat resistance, can be heated under high temperature without deformation without harmful substances. It can be used almost forever at 150 ° C without performance changes, can be used continuously for 10,000 hours at 200 ° C, and can be used for a period of time at 350 ° C. Widely used in applications requiring heat resistance, such as: hot water bottle sealing ring.
Low temperature resistance: ordinary rubber -20 ° C ~ -30 ° C will become hardened and brittle, while silicone rubber still has good elasticity at -60 ° C ~ -70 ° C, some special formulations of silicone rubber can also withstand more harsh extremely low temperatures, such as: low temperature sealing rings, the lowest can reach -100 ° C.
7.High permeability and selectivity of gas transmission
Because the molecular structure of silica gel makes the silicone sealing ring have good permeability and good selectivity for gas, the permeability of silicone rubber to air, nitrogen, oxygen, carbon dioxide and other gases at room temperature is 30-50 times higher than that of natural rubber.
Disadvantages of silicone rubber sealing ring
- Tensile strength and tear strength mechanical properties are poor
For stretching, tearing, and strong wear in the working environment, it is not recommended to use silicone seals, which are usually only used for static sealing.
- Although silicone rubber is compatible with most oils, compounds and solvents, it has good acid and alkaline resistance, but it has no resistance to alkane, hydrogen and aromatic oils. Therefore, it is not suitable for use in an environment with a working pressure of more than 50 pounds. In addition, it is not recommended to use silicone seals in most concentrated solvents, oils, concentrated acids and diluted caustic soda solutions.
- The price is relative to other materials, silicone sealing rubber ring, the manufacturing cost is relatively high.
