What is ISO 21250-2 about?
ISO 21250-2 is the second part of the multi-series of International Standard on rolling bearings. ISO 21250-2 is applicable to the noise testing of rolling bearing greases with testing and evaluation procedures in accordance with method BQ+.
Who is ISO 21250-2 for?
ISO 21250-2 on noise testing of rolling bearing greases is useful for:
- Manufacturers of rolling bearings
- Automotive industry
- Lubricant manufacturers
- Electrical engineers 
- Mechanical engineers
Why should you use ISO 21250-2?
The rolling bearing life theory emphasizes the use of pure and homogeneous lubricants as essential for a long bearing service life. The method described in ISO 21250-2 for determining the purity grade of bearing grease is influenced by thickeners, base oils, additives, and solid lubricant additives, as well as the manufacturing process, and this is reflected in the running noise. As a result, rolling bearing grease noise testing is advised.
Furthermore, ISO 21250-2 grease noise testing enables grease makers to design low-noise lubricants with improved damping qualities.
ISO 21250-2 specifies the specifications for the testing assembly and test machine used in method BQ+ to jointly determine and assess the noise characteristics of rolling bearing grease.
With the BQ+ method, you will be able to benefit from the increased levels of automation, which offer reliable and accurate results, which helps you eliminate risk of contamination.
Overall, compliance to ISO 21250-2 will assist you in determining the quality of grease noise or selecting low-noise (quieter) greases. Ultimately, you will be able to avoid incidence of high fatigue life of bearings. If you are a bearing producer, ISO 21250-2 will help you select the right grease.
