New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 1) which is identical with ISO 21250-1 : 2020 ‘Rolling bearings - Noise testing of rolling bearing greases - Part 1: Basic principles, testing assembly and test machine’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Bearings Sectional Committee and approval of the Production and General Engineering Department. The rolling bearing life theory emphasizes the use of pure and homogeneous lubricants as essential for a long bearing service life. Grease lubrication is the most common type of rolling bearing lubrication.

The purity grade of bearing grease is influenced by thickeners, base oils, additives and solid lubricant additives as well as the manufacturing process and is reflected in the running noise. Therefore, noise testing of rolling bearing greases is recommended.