IS 9154 : 2020/ISO 695 : 1991 Method for Determination of Alkali Resistance of Glass

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (First Revision), which is identical with ISO 695 : 1991 ‘Glass — Resistance to attack by a boiling aqueous solution of mixed alkali — Method of test and classification’ issued by the International Organization for Standardization (ISO), was adopted by the Bureau of Indian Standards on recommendation of the Glass, Glassware and Laboratoryware Sectional Committee and approval of the Chemical Division Council.

In the production of glassware, its end use is an important consideration. For this, it is necessary to ensure that glass having appropriate characteristics is chosen. Chemical durability of glass is one of the most important characteristics which determine suitability of a glass and comprises resistance of glass to attack by water, acids and alkalis depending on the nature of the medium in contact with it. This standard prescribes a method for determining the resistance of glass to attack by a boiling aqueous solution of sodium carbonate and sodium hydroxide and its classification on that basis into three types.

This standard was originally published in 1978. In this revision, the committee decided to revise this standard by aligning it with ISO 695 : 1991 under dual numbering system, to make pace with the latest international practices.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and 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.