Rubber seal products commonly used materials

General Purpose Rubber Sealing Products General rubber sealing products have become more and more widely used in defense, chemical, coal, petroleum, metallurgy, transportation, and mechanical manufacturing industries, and have become basic parts and accessories in various industries.

Rubber sealing products commonly used materials are as follows.

1 Nitrile rubber Nitrile rubber has excellent resistance to fuel oil and aromatic solvents, but does not tolerate media such as ketones, esters, and hydrogen chloride. Therefore, oil-resistant sealed products and nitrile-based rubbers are mainly used.

2 neoprene neoprene has good oil and solvent resistance. It has good resistance to gear oil and transformer oil, but it is not resistant to aromatic oils. Neoprene also has excellent weathering and ozone aging properties. Neoprene cross-linking fracture temperature is above 200 °C, usually made of neoprene rubber seals. Neoprene also has good corrosion resistance to inorganic acids. In addition, because the neoprene rubber also has good flexibility and airtightness, it can be made into sealed products for diaphragm and vacuum.

3 Natural rubber Compared with most synthetic rubbers, natural rubber has good comprehensive mechanical properties, cold resistance, high resilience and abrasion resistance. Natural rubber is not resistant to mineral oil, but it is relatively stable in vegetable oils and alcohols. In the hydraulic brake system of brake fluid composed of n-butanol and refined castor oil, the rubber ring is used as a seal. The rubber ring is made of natural rubber, and the sealant is usually made of natural rubber.

4 Fluoro rubber Fluororubber has outstanding heat resistance (200-250 °C), oil resistance, can be used to manufacture cylinder liner seals, plastic bowls and rotating lip seals, can significantly improve the use of time.

5 Silicone rubber Silicone rubber has outstanding resistance to high and low temperature, ozone and weathering resistance. It can maintain its unique use elasticity, ozone resistance, weather resistance and other advantages in the operating temperature range of -70 ~ 260 °C, suitable for the production of heat Seals required in the mechanism, such as strong light source lampshade seal gaskets, valve gaskets, etc. Because silicone rubber is not oil resistant, it has low mechanical strength and is expensive, so it is not suitable to make oil-resistant sealing products.

6 EPDM rubber The main chain of EPDM rubber is a fully saturated, straight-chain structure with no double bonds. Diene hydrazine is present in the side chain, which can be used to make the chain. EPDM rubber has excellent resistance to aging, ozone resistance, weather resistance, heat resistance (long-term use in 120 °C environment), chemical resistance (such as alcohol, acid, alkali, oxidant), but not Resistant to aliphatic and aromatic solvents. EPDM rubber has the highest filling density in rubber, but lacks self-adhesion and mutual stickiness. In addition, EPDM rubber has outstanding steam resistance and can be used to make sealing products such as steam-resistant diaphragms. EPDM rubber has been widely used in washing machines, fittings in TV sets and sealing products for doors and windows, or in the production of plastic strips with various composite profiles.

7 Polyurethane Rubber Polyurethane rubber has excellent wearability and good airtightness, and the use temperature range is generally -20 ~ 80 °C. In addition, it also has moderate oil, oxygen and ozone aging properties, but not acid and alkali, water, steam and ketones. Suitable for the manufacture of a variety of rubber sealing products, such as oil seals, O-rings and diaphragms.

8 Chloroether rubber Chloroether rubber combines the advantages of acrylonitrile-butadiene rubber, chloroprene rubber and acrylonitrile rubber. Its oil resistance, heat resistance, ozone resistance, flame resistance, alkali resistance, water resistance and organic solvent resistance are very good. The process performance, its poor cold resistance. In the case where the use temperature is not too low, the chlorine ether rubber is still a good material for the production of seals, various seals, gaskets, diaphragms, and dust covers.

9 Acrylic Rubber Acrylic rubber has heat-resistant oils (mineral oil, lubricating oil and fuel oil), especially oil stability at high temperatures, typically up to 175°C, and can be used in gaps or in short-term temperatures up to 200°C. Its disadvantage is poor cold resistance. Therefore, it is suitable for making oil seals of high-temperature oil in non-cold areas, but it is not suitable for sealing products that are subject to tensile or compressive stress at high temperatures.