IS 6489 : PART 4 : 2011 : Textiles - Tear Properties of Fabrics Part 4 Determination of Tear Force of Tongue-Shaped Test Specimens(Double Tear Test)

Reaffirmed 2021

NATIONAL FOREWORD

This Indian Standard (Part 4) (Second Revision) which is identical with ISO 13937-4 : 2000 ‘Textiles - Tear properties of fabrics — Part 4 : Determination of tear force of tongue-shaped test specimens (Double tear test)’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Physical Methods of Test Sectional Committee and approval of the Textile Division Council.

This standard was first published in 1971 and subsequently revised in 1993. This standard has been revised again to align it with the latest version of ISO 13937-4 : 2000 by adoption under dual numbering system. Since ISO 13937 has been published in four parts, this standard has also been published in four parts. Other parts in this series are:

Part 1 Determination of tear force using ballistic pendulum method (Elmendorf)

Part 2 Determination of tear force of trouser-shaped test specimens (Single tear method)

Part 3 Determination of tear force of wing-shaped test specimens (Single tear method)

The conditioning temperature of 20 ± 2°C as specified in International Standards is not suitable for tropical countries like India where the atmospheric temperature is normally much higher than 20°C. It is almost impossible to maintain this temperature specially during summer when the atmospheric temperature rises even up to 50°C. In view of the above, IS 6359 : 1971 ‘Method for conditioning of textiles’ which specifies a temperature of 27 ± 2°C for conditioning of the test specimens for the tropical countries like India shall be referred.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard with the above 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.