[ Supersedes IS 3400 (Part 17) : 1971 ]

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (Part 12) (First Revision) which is identical with ISO 34-1 : 2015 ‘Rubber, vulcanized or thermoplastic - Determination of tear strength - Part 1: Trouser, angle and crescent test pieces’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Methods of Test for Rubber and Rubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council.

The tear strength depends on the dimension of the test piece, speed of stretching, temperature of test and the stress distribution in the test piece hence the test is satisfactory only for laboratory comparison and not as a service test. The tear strength is particularly susceptible to grain effects in vulcanized rubber. Where an estimate of service behavior is desired, service trials on actual article should be carried out.

This Indian Standard was originally published in 1971 by taking assistance from ISO/R 34. The first revision of this standard has been undertaken to align it with the latest version of ISO 34-1 : 2015.