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Bearing Seal Materials


Bearing seal materials do vary depending on the application environment and requirements. The following is a detailed explanation of the bearing dust cover and seal ring materials you mentioned:

Bearing dust cover material:

  • Cold-rolled electroplated tin steel plate: This material is usually used to make stamped steel plate dust covers, and the structure of the outer ring is reinforced by stamping processing. It has good strength and corrosion resistance and is suitable for general working environments.
  • ASI-300 stainless steel: In some special environments, such as when higher corrosion resistance is required, stainless steel materials are used to make dust covers. ASI-300 stainless steel is a commonly used stainless steel material with excellent corrosion resistance.

Bearing sealing ring material:

  • Nitrile rubber (NBR): Nitrile rubber is one of the commonly used materials for sealing rings. It has good oil resistance, wear resistance and aging resistance. Nitrile rubber sealing rings are generally suitable for bearing sealing under normal temperature and pressure conditions.
  • Fluorine rubber (FKM/FPM): Fluorine rubber is a material that is resistant to high temperatures and chemical corrosion, so it is often used in bearing seals that need to withstand high temperatures or chemical corrosion. Fluorine rubber sealing rings can maintain stable sealing performance in a higher temperature range.
  • Silicone rubber (MQ/PMQ/VMQ/PVMP): Silicone rubber sealing ring has excellent high temperature resistance, cold resistance and aging resistance, and can maintain stable sealing performance in a wide temperature range. In addition, silicone rubber also has good electrical insulation properties.
  • Polypropylene rubber (ACM Rubber): Polypropylene rubber sealing rings have good resistance to hot oil, sunlight and ozone, and are suitable for some specific industrial applications. However, its waterproof performance is relatively poor and it is not suitable for working at ultra-low temperatures.


When selecting bearing seal materials, factors such as application environment, temperature, pressure, medium properties, etc. need to be considered to ensure that the seal can meet the requirements of actual working conditions. At the same time, it is also necessary to pay attention to the matching between the seal and the bearing to ensure a good sealing effect.