NATIONAL FOREWORD

This Indian Standard (Fourth Revision) which is identical with ISO 525 : 2013 ‘Bonded abrasive products — General requirements’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Abrasives Sectional Committee and approval of the Production and General Engineering Division Council.

This standard was originally published in 1954 and subsequently revised in 1966, 1989 and 2013. This fourth revision has been undertaken to harmonize it with ISO 525 : 2013. In this revision, besides other changes, includes:

a) clarification has been included in the Scope to explicitly exclude coated abrasive products;

b) in Clause 4, Table 2, the description of some existing types of bonded abrasives products has been changed and type numbers 17, 17R, 19R, 29 and 40 have been included;

c) in Clause 5, requirements for maximum operating speeds have been deleted;

d) Clause 6 on designation has been reworded and included in Clause 5; and

e) additional marking requirements have been included.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current-practice is to use a point (.) as the decimal marker.