To stop lubricating oil from leaking out and foreign items from getting in, an annular cover made of one or more components is fastened on one ring or washer of the bearing and contacts another ring or washer, creating a small gap known as a labyrinth. Rubber rings with a circular cross-section make up the sealing ring. It is known as an O-shaped sealing ring because of its O-shaped cross-section.

1. NBR nitrile rubber sealing ring

Water, gasoline, silicone grease, silicone oil, diester-based lubricating oil, petroleum-based hydraulic oil, and other media can all be used with it. Right now, it’s the least expensive and most commonly used rubber seal. Not recommended for use with polar solvents like chloroform, nitrohydrocarbons, ketones, ozone, and MEK. The standard temperature range for operation is -40 to 120 °C.

2. HNBR hydrogenated nitrile rubber sealing ring

It has good resistance to ozone, sunshine, and weather, and it is highly resistant to corrosion, rips, and compression deformation. Greater durability compared to nitrile rubber. Ideal for cleaning car engines and other gear. It is not advised to use this with aromatic solutions, alcohols, or esters. The standard temperature range for operation is -40 to 150 °C.

3. SIL silicone rubber sealing ring

Excellent resistance to heat, cold, ozone, and atmospheric aging is possessed by it. possesses excellent insulating qualities. It is not oil-resistant, and its tensile strength is lower than that of regular rubber. Ideal for using with electric water heaters, electric irons, microwave ovens, and other household equipment. It is also appropriate for a variety of objects, such drinking fountains and kettles, that come into contact with human skin. It is not advised to utilize sodium hydroxide, oils, concentrated acids, or most concentrated solvents. The temperature range for ordinary operation is -55~250 °C.

4. VITON fluorine rubber sealing ring

Its exceptional weather, ozone, and chemical resistance is matched by its superior high temperature resistance; nevertheless, its cold resistance is subpar. The majority of oils and solvents, particularly acids, aliphatic and aromatic hydrocarbons, as well as vegetable and animal oils, do not affect it. Ideal for fuel systems, chemical facilities, and diesel engine sealing requirements. Use with ketones, low molecular weight esters, and mixes containing nitrates is not advised. -20 to 250 °C is the typical operational temperature range.

5. FLS fluorosilicone rubber sealing ring

Its performance combines the best qualities of silicone and fluorine rubber. It is also very resistant to solvents, fuel oils, high and low temperatures, and oils. able to withstand the erosion of chemicals including oxygen, solvents containing aromatic hydrocarbons, and solvents containing chlorine. -50~200 °C is the typical operating temperature range.

6. EPDM EPDM rubber sealing ring

It is water resistant, chemical resistant, ozone resistant, and weather resistant. It works well for sealing applications involving alcohols and ketones as well as high-temperature water vapor. The standard temperature range for operation is -55 to 150 °C.

7. CR neoprene sealing ring

It is especially resilient to weather and sunlight. It is resistant to diluted acids and silicone grease lubricants, and it is not scared of refrigerants like dichlorodifluoromethane and ammonia. On the other hand, it significantly expands in mineral oils with low aniline points. Low temperatures make crystallization and hardening simple. It is appropriate for a range of atmospheric, solar, and ozone-exposed conditions as well as for a range of chemically and flame-resistant sealing linkages. Use with strong acids, nitrohydrocarbons, esters, ketone compounds, and chloroform is not advised. The standard temperature range for operation is -55 to 120 °C.

8. IIR butyl rubber sealing ring

It performs particularly well in terms of air tightness, heat resistance, UV resistance, ozone resistance, and insulation; additionally, it can withstand exposure to oxidizable materials and animal and vegetable oils and has good resistance to polar solvents including alcohols, ketones, and esters. Fit for vacuum or chemical resistance equipment. It is not advised to use it with kerosene, aromatic hydrocarbons, or petroleum solvents. -50 to 110 °C is the typical operational temperature range.

9. ACM acrylic rubber sealing ring

Its weather resistance, oil resistance, and compression deformation rate are all somewhat below average, however its mechanical strength, water resistance, and high temperature resistance are all excellent. Typically found in power steering and gearbox systems of cars. Not recommended for use with brake fluid, hot water, or phosphate esters. The standard temperature range for operation is -25 to 170 °C.

10. NR natural rubber sealing ring

Rubber goods are strong against tearing, elongation, wear, and elasticity. It does, however, age quickly in the air, stick when heated, expand readily, dissolve in mineral oil or gasoline, and withstand mild acid but not strong alkali. Appropriate for usage in liquids with hydroxyl ions, such ethanol and car brake fluid. -20 to 100 °C is the typical operating temperature range.

11. PU polyurethane rubber sealing ring

Polyurethane rubber has excellent mechanical qualities; it outperforms other rubbers in terms of wear resistance and high pressure resistance. Its resistance to aging, ozone, and oil is likewise fairly excellent; but, at high temperatures, it is susceptible to hydrolysis. Typically utilized for sealing connections that can withstand wear and high pressure. The standard temperature range for operation is -45 to 90 °C.