New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with ISO 4803 : 2021 ‘Laboratory glassware - Borosilicate glass tubing’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the the Glass, Glassware and Laboratoryware Sectional Committee and approval of the Chemical Division Council.

This standard specifies requirements for an internationally acceptable range of borosilicate glass tubing for laboratory apparatus.

Borosilicate glasses show properties such as a very high hydrolytic resistance, a very high acid resistance and a medium alkali resistance. Borosilicate glasses can contain alkali earths or be free of alkali earths. The alkali-earth free borosilicate glasses have a very low coefficient of mean linear thermal expansion alpha of 3.3 × 10-6 K-1 (in the temperature range from 20 to 300 °C).