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Dongguan Minz Rubber & Plastics Co., Ltd.

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The advantages of silicone sealing ring, the disadvantages of silicone sealing ring

Release time:

2019-05-21 12:30

Source:

Silicone sealing ringAdvantages, disadvantages of silicone seals
 
Among the many synthetic rubbers, silicone is one of the best.
It has the characteristics of tasteless and non-toxic, not afraid of high temperature and resisting severe cold. It is "calm" and "does not change color" at 300 degrees Celsius and minus 90 degrees Celsius, and still does not lose its original strength and elasticity. Silicone also has good electrical insulation, oxygen resistance and aging resistance, light resistance and mildew resistance, chemical stability, etc.
 
Because of these excellent properties, silica gel has played an important role in modern medicine. In recent years, hospitals, scientific research units and factories have worked together to successfully trial-produce a variety of silicone medical supplies.
 
Advantages: Silica gel has excellent heat resistance, cold resistance, dielectric properties, ozone resistance and atmospheric aging resistance. The outstanding performance of silica gel is that it can be used at -90°C (or lower temperature) to 300°C (or higher temperature). Long-term use.
 
However, the tensile strength and tear strength of silica gel are poor, and its physical and mechanical properties are not as good as most synthetic rubbers at room temperature. In addition to nitrile silicon and fluorine silica gel, the general silica gel has poor oil resistance and solvent resistance. Therefore, silica gel is not suitable for ordinary occasions, but it is very suitable for many specific occasions.
 
Heat resistance: silica gel has much better heat resistance than ordinary rubber, can be used almost forever at 150 ° without performance change, can be used continuously for 10000 hours at 200 °, and can be used for a period of time at 350 °. Widely used in heat-resistant occasions, hot water bottle sealing ring, pressure pot ring heat-resistant handle.
 
Cold resistance: ordinary rubber late for -20 °-30 °, that is, silica gel in -60 °-70 ° still has good elasticity, some special formula of silica gel can also withstand very low temperatures, such as: low temperature sealing ring.
 
The advantages of silicone sealing ring:
 
1, excellent weather resistance, the Si-O-Si bond in the silica gel is very stable to oxygen, ozone and ultraviolet light, and has excellent resistance to the erosion of ozone and oxides. In the case of not adding any additives, it has excellent weather resistance, and even if it is used outdoors for a long time, cracks do not occur. It is generally believed that silicone seals can be used outdoors for more than 20 years.
 
2, material safety and environmental protection silica gel has its unique physiological inertia, non-toxic, tasteless, odorless, good preservation effect, and less interference by the external environment, long-term use does not change yellow, do not fade. And in line with the national food and medical health standards, more used in food, medicine, aluminum paste and all kinds of oil filter to remove impurities.
 
3. Good electrical insulation performance Organic silica gel has excellent electrical insulation performance, corona resistance and arc resistance are also very good.
 
4, high permeability and selectivity of gas permeability due to the molecular structure of silica gel, silica gel sealing ring has good permeability and good selectivity to gas, silica gel at room temperature on air, nitrogen, oxygen, carbon dioxide and other gases permeability than natural rubber 30-50 times higher.
 
5. The surface energy of the silicone ring with moisture absorption performance is low, which has the function of absorbing the moisture in the environment and plays the role of isolation.
 
6. Wide range of high and low temperature resistance
 
7. After modulation, the tensile strength can reach 500PSI and the resistance can reach 88LBS.
 
8. Good and good compression deformation.
 
9. It has good resistance to neutral solvents.
 
10, with excellent heat resistance.
 
11, with excellent cold resistance.
 
12. It has excellent resistance to ozone and oxide erosion.
 
High temperature resistance:Silicone sealing ringCan be placed under high temperature heating without deformation does not produce harmful substances. It can be used almost forever at 150°C without performance change, can be used continuously for 10000 hours at 200°C, and can be used for a period of time at 350°C. Widely used in heat-resistant occasions, such as: hot water bottle sealing ring. Low temperature resistance: silica gel still has good elasticity at -60 ℃ ~-70 ℃, and some specially formulated silica gel can withstand more severe extremely low temperatures, such as: low temperature sealing ring, the lowest can reach -100 ℃.
 
Disadvantages of silicone sealing ring
 
1. The mechanical properties of tensile strength and tear strength are poor. It is not recommended to use silicone sealing ring for stretching, tearing and strong wear in the working environment. Normally, only static sealing is used.
 
2. Silica gel has good acid and alkali resistance, but it has no resistance to alkane 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 silica gel seals in most concentrated solvents, oils, concentrated acids and diluted caustic solutions.
 
3. Silicone sealing ring, the manufacturing cost is relatively high.
 
4. It is not recommended to be used in most thick-shrunk solvents, oils, thick-shrunk acids and diluted sodium hydroxide.
 
5. Seals or rubber parts in the electronics industry, such as mobile phone buttons, shock absorbers in DVD, seals in cable connection, etc.
 
6. It is not recommended to be used in most of the thick shrinkage solvents, oils, thick shrinkage acids and diluted sodium hydroxide.
 
7, the price of silicone O-ring relative to other silicone products are more expensive, while the corrosion resistance is not as good as other silicone products, in the acid and alkali resistance to chemical solvents above slightly insufficient, in terms of mechanical tensile strength is relatively low. Above is Dongguan silicone products manufacturersName of silica gelFor you to sort out the advantages and disadvantages of silicone seals, if you have other questions, please contact us.

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