1. NBR nitrile rubber sealing ring: suitable for use in petroleum-based hydraulic oil, glycol-based hydraulic oil, diester-based lubricating oil, gasoline, water, silicone grease, silicone oil and other media. It is the most versatile and lowest cost rubber seal. Not suitable for polar solvents such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. The general operating temperature range is -40~120 ℃.
2. HNBR hydrogenated nitrile rubber sealing ring: It has excellent corrosion resistance, tear resistance and compression deformation resistance, and has good ozone resistance, sunlight resistance and weather resistance. Better abrasion resistance than nitrile rubber. It is suitable for washing machines, automobile engine systems and refrigeration systems using new environmentally friendly refrigerant R134a. Not recommended for use in alcohols, esters or aromatic solutions. The general operating temperature range is -40~150 ℃.
3. SIL silicone rubber sealing ring: It has excellent heat resistance, cold resistance, ozone resistance and atmospheric aging resistance. It has good insulating properties. But the tensile strength is worse than ordinary rubber and not oil resistant. Suitable for household appliances such as electric water heaters, electric irons, microwave ovens, etc. It is also suitable for various articles that come into contact with the human body, such as kettles, water dispensers, etc. Not recommended for use in most concentrated solvents, oils, concentrated acids and sodium hydroxide. The general operating temperature range is -55~250 ℃.
4. VITON fluorine rubber sealing ring: High temperature resistance is better than silicone rubber, and it has excellent weather resistance, ozone resistance and chemical resistance, but poor cold resistance. It is resistant to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils. Suitable for sealing requirements of diesel engines, fuel systems and chemical plants. It is not recommended to be used in ketones, low molecular weight esters and mixtures containing nitrous. The general operating temperature range is -20~250 ℃.
5. FLS fluorosilicone rubber sealing ring: Its performance has the advantages of fluororubber and silicone rubber, and it is resistant to oil, solvent, fuel oil and high and low temperature. It can resist the corrosion of oxygen-containing compounds, solvents containing aromatic hydrocarbons and solvents containing chlorine. Generally used in aviation, aerospace and military purposes. Exposure to ketones and brake fluid is not recommended. The general operating temperature range is -50~200 ℃.
6. EPDM EPDM sealing ring: It has good weather resistance, ozone resistance, water resistance and chemical resistance. It can be used for alcohols and ketones, and can also be used for sealing in high temperature water vapor environment. Applicable to bathroom equipment, car radiator and car brake system. Not recommended for food use or exposure to mineral oil. The general operating temperature range is -55~150 ℃.
7. CR neoprene sealing ring: It is particularly good in sunlight resistance and weather resistance. Not afraid of refrigerants such as dichlorodifluoromethane and ammonia, resistant to dilute acid and silicone grease, but has a large expansion in mineral oil with a low aniline point. It is easy to crystallize and harden at low temperature. It is suitable for various environments exposed to the atmosphere, sunlight, and ozone, as well as various flame-resistant and chemical-resistant sealed environments. Not recommended for use with strong acids, nitro hydrocarbons, esters, chloroform and ketones. The general operating temperature range is -55~120 ℃.
8. IIR butyl rubber sealing ring: especially good air tightness, good heat resistance, sunlight resistance, ozone resistance, good insulation performance; good resistance to polar solvents such as alcohols, ketones, esters, etc., can be exposed In animal and vegetable oils or oxidizable. Suitable for chemical resistance or vacuum equipment. Not recommended for simultaneous use with white spirit, kerosene or aromatics. The general operating temperature range is -50~110 ℃.
9. ACM acrylic resin rubber sealing ring: It has excellent resistance to oil, high temperature resistance and weather resistance, but its mechanical strength, compression deformation rate and water resistance are slightly poor. Generally used in automobile transmission system and power steering system. Not suitable for hot water, brake fluid, phosphate esters. The general operating temperature range is -25~170 ℃.
10. NR natural rubber sealing ring: It has good wear resistance, elasticity, breaking strength and elongation. However, it is easy to age in the air, becomes sticky when heated, easily expands and dissolves in mineral oil or gasoline, and is resistant to alkali but not to strong acid. It is suitable for use in liquids with hydroxide ions such as automobile brake fluid and ethanol. The general operating temperature range is -20~100 ℃.
11. PU polyurethane rubber sealing ring: The mechanical properties of polyurethane rubber are very good, and its wear resistance and high pressure resistance are far superior to other rubbers. Aging resistance, ozone resistance and oil resistance are also quite good, but it is easy to hydrolyze at high temperature. Generally used for high pressure and wear resistant sealing links, such as hydraulic cylinders. The general operating temperature range is -45~90 ℃.
12. Metal rubber sealing ring: It is made of stainless steel wire, does not contain any rubber components, and has strong usage characteristics. For example: maintain normal work in high vacuum, high and low temperature, strong radiation, and various corrosion environments. The skin of the sealing ring is made of different materials such as stainless steel, copper, PTFE and other materials according to different uses. The covered metal rubber component is used as the lining core, which has the advantages of high sealing strength, good effect, and reusability. The sealing ring core is made of different metal wire diameters and densities, and is suitable for different pressure occasions. The general use range is -80~800℃. Due to the high cost of this kind of sealing ring, the price is relatively expensive. However, good performance and a wide range of use environments have been unanimously recognized by people.