NBN EN ISO 13937-3 : 2000

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Sampling
6 Apparatus
7 Atmosphere for conditioning and testing
8 Preparation of test specimens
9 Procedure
10 Calculation and expression of results
11 Test report
Annex A (informative) Suggested procedure for sampling
Annex B (informative) Example of pattern for cutting out
                      test specimens from the laboratory
                      sample
Annex C (informative) Sample calculation of tear force
Bibliography

Establishes a single tear method to determine fabric tear force, known as the wing test using a test specimen that has been cut to form two wings for clamping and inclined at a defined angle to the thread direction. The test force measurement is the force needed to propagate a previously started tear. Applies primarily to woven textile fabrics, but can also be applied to fabrics produced by other techniques. Does not generally cover knitted fabrics, woven elastic fabrics and non-wovens, where the trapezoidal test would be more favourable.