Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Third Revision) which is identical with ISO 2302 : 2020 Isobutene-isoprene rubber (IIR) - Evaluation procedure’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation(s) of the Methods of Test for Rubber and Rubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was first published in 2000 under dual numbering system and subsequently revised in 2013 and 2018. The third revision is being carried out to align it with the latest published ISO 2302 : 2020 on the subject.

The main changes in this revision are:

— the normative references have been updated in Clause 2, 5.3 and Clause 10 (d), where ISO 247 has been replaced by ISO 247-1 and ISO 247-2;

— the normative references have been updated in Clause 2, 6.2.2.3 (j) and 7.1, where ISO 3417 has been replaced by ISO 6502-2;

— a footnote has been added to Table 1 allowing the possibility to replace TMDT by an alternative curative.