Comparison Of Various Rubber Seal Materials
An annular cover composed of one or several parts is fixed on a ring or washer of the bearing and contacts another ring or washer or forms a narrow labyrinth gap to prevent the leakage of lubricating oil and the intrusion of foreign objects. The sealing ring is a rubber ring with a circular cross section. Because its cross section is O-shaped, it is called an O-shaped sealing ring. It is the most widely used one in hydraulic and pneumatic transmission systems.
1. NBR nitrile rubber seal
It is suitable for use in petroleum hydraulic oil, glycol hydraulic oil, diester lubricating oil, gasoline, water, silicone grease, silicone oil and other media. It is currently the most versatile and lowest cost rubber seal. Not suitable for polar solvents such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. The general temperature range is -40~120 ℃.
2. HNBR hydrogenated nitrile rubber seal
It has excellent corrosion resistance, tear resistance and compression deformation resistance, and has good resistance to ozone, sunlight and weather. It has better abrasion resistance than nitrile rubber. It is suitable for washing machinery, automobile engine system and refrigeration system using new environmentally friendly refrigerant R134a. It is not recommended to use in alcohols, esters or aromatic solutions. The general use temperature range is -40~150 ℃.
3. SIL silicone rubber sealing ring
It has excellent heat resistance, cold resistance, ozone resistance and atmospheric aging resistance. Has good insulation properties. But the tensile strength is worse than general rubber and it has no oil resistance. Suitable for household appliances such as electric water heaters, electric irons, microwave ovens, etc. It is also suitable for all kinds of articles that are in contact with the human body, such as kettles, drinking fountains, etc. It is not recommended to use in most concentrated solvents, oils, concentrated acids and sodium hydroxide. The general use temperature range is -55~250 ℃.
4. VITON fluorine rubber sealing ring
High temperature resistance is better than silicone rubber, excellent weather resistance, ozone resistance and chemical resistance, but poor cold resistance. It has resistance to most oils and solvents, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils. It is suitable for the sealing requirements of diesel engines, fuel systems and chemical plants. Not recommended for use in ketones, low molecular weight esters and nitrate-containing mixtures. The general temperature range is -20~250 ℃.
5. FLS fluorosilicone rubber sealing ring
Its performance combines the advantages of fluorocarbon rubber and silicone rubber, and has good oil resistance, solvent resistance, fuel oil resistance and high and low temperature resistance. It can resist the corrosion of oxygen-containing compounds, aromatic hydrocarbon-containing solvents and chlorine-containing solvents. Generally used for aviation, aerospace and military purposes. Manufacturers of rubber foam rolls do not recommend exposure to ketones and brake fluid. The general use temperature range is -50~200 ℃.
6. EPDM rubber seal 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. It is suitable for sanitary 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 seal
It is particularly resistant to sunlight and weather. It is not afraid of refrigerants such as dichlorodifluoromethane and ammonia. It is resistant to dilute acid and silicone grease, but it has a large expansion in mineral oil with low aniline point. It is easy to crystallize and harden at low temperatures. It is suitable for all kinds of environments exposed to the atmosphere, sunlight, ozone and various flame-resistant and chemical-resistant sealing links. It is not recommended to use in strong acids, nitro hydrocarbons, esters, chloroform and ketones. The general use temperature range is -55~120 ℃.
8. IIR Butyl Rubber Sealing Ring
Air tightness is particularly good, heat resistance, sunlight resistance, ozone resistance, good insulation properties; good resistance to polar solvents such as alcohols, ketones, esters, etc., and can be exposed to animal and vegetable oils or oxidizable. Suitable for chemical resistance or vacuum equipment. It is not recommended to use it with petroleum solvents, kerosene or aromatic hydrocarbons. The general use temperature range is -50~110 ℃.
9. ACM Acrylic Rubber Sealing Ring
It has excellent resistance to oil, high temperature resistance and weather resistance, but the mechanical strength, compression set and water resistance are slightly poor. Generally used in automobile transmission systems and power steering systems. Not suitable for hot water, brake fluid, phosphate ester. The general use temperature range is -25~170 ℃.
10. NR natural rubber sealing ring
Rubber products have good wear resistance, elasticity, breaking strength and elongation. However, it is easy to age in the air, becomes sticky when heated, easily swells and dissolves in mineral oil or gasoline, and is resistant to alkali but not strong acid. It is suitable for use in liquids containing hydroxide ions such as automobile brake fluid and ethanol. The general use temperature range is -20~100 ℃.
11. PU polyurethane rubber sealing ring
Polyurethane rubber has very good mechanical properties, and its wear resistance and high pressure resistance are far superior to other rubbers. The aging resistance, ozone resistance, and oil resistance are also quite good, but it is easily hydrolyzed at high temperature. Generally used in high pressure and wear resistant sealing links, such as hydraulic cylinders. The general 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 use characteristics. For example: maintain normal work under high vacuum, high and low temperature, strong radiation, and various corrosive environments. The surface of the seal ring is made of different materials such as stainless steel, copper, polytetrafluoroethylene and other materials according to different uses. The coated metal rubber component is used as the lining core, which has the advantages of high sealing strength, good effect, and reusability. The gasket core is a component made of different metal wire diameters and densities, suitable for different pressure occasions. The general use range is -80~800℃. Because of the high cost of this kind of sealing ring, the price is relatively expensive. But the good performance and the extensive use environment have been unanimously recognized by people.
Haining Qianlang Rubber Products Factory
ADD: NO.10-2, Lianbao Road, Qianjiang Industrial Park, Dingqiao Town, Haining, Zhejiang 314413, China
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