ICS 71.040.20                          CHD 10

Reaffirmed 2022

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical with ISO 383 : 1976 ‘Laboratory glassware — Interchangeable conical ground joints’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Glass, Glassware and Laboratoryware Sectional Committee and approval of the Chemical Division Council.

To ensure interchangeability between conical ground-glass joints, irrespective of where they are made, it is necessary that their requirements such as taper, large end diameter, length of ground zone and surface finish, including appropriate tolerances, be adequately specified. These aspects were well taken care of in the original standard published in 1969 by prescribing the nominal dimensions of joints already widely used then in many countries.

Considering the importance of following uniform practices globally, the committee felt the need of revising this standard and also felt that it would be more convenient to prepare this standard by adoption of ISO 383 on dual number basis. In this revision the title of this standard has been modified in line with ISO standard.

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’ appears 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.

In this adopted standard, reference appears to certain International Standards where the standard atmospheric conditions to be observed are stipulated which are not applicable to tropical/subtropical countries. The applicable standard atmospheric conditions for Indian conditions are 27 ± 2°C and 65 ± 5 percent relative humidity and shall be observed while using this standard.