Reaffirmed 2022

NATIONAL FOREWORD

This Indian Standard (Part 6/Sec 17) (Second Revision) which is identical with ISO 75-2 : 2013 ‘Plastics - Determination of temperature of deflection under load - Part 2: Plastics and ebonite’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Plastics Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

This standard was originally published in 1997, identical with ISO 75-2 : 1993 and subsequently revised in 2013 to align it with ISO 75-2 : 2004. The second revision of this standard has been undertaken to align it with the latest version of ISO 75-2 : 2013.

The major changes are as follows:

- clause 3 ‘terms and definitions has been updated;

- the edgewise test position with the test conditions has been completely removed. Reason being the ‘80 mm × 10 mm × 4 mm ISO bars’ cannot be easily used in the edgewise position because this would require both a reduction in span and an increase in test load by the same factor, and this may be impossible to achieve on existing instruments for edgewise testing;

- under ‘Precision’ (Annex A), addition precision statement covering the new heating methods has been introduced; and

- the normative references have been updated.

This standard (Part 6) has various sections under general title ‘Plastics - Method of testing : Part 6 Thermal properties’. Other sections in this series are:

Section 3 Determination of temperature of deflection under load - General test method

Section 18 Determination of temperature of deflection under load - High-strength thermosetting laminates and long-fibre-reinforced plastics

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.