BS EN ISO 4674-1:2016 pdf download.Rubber- or plastics-coated fabrics - Determination of tear resistance Part 1: Constant rate of tear methods.
7.2 Procedure
Adjust the test machine to give a rate of jaw traverse of (100 ± 10) mm/min, and select the appropriateload capacity range.Engage and zero the autographic recorder.Adjust the jaw separation to i00 mm.Clamp the tongue of the test piece centrally and symmetrically in the jaw so that the line BC is justvisible, as illustrated in Figure 3. Clamp the legs of the test piece symmetrically in the other jaw of themachine so that the lines AB and CD are just visible and the legs of the test piece are parallel to thetearing force.
Set the test machine in motion at the specified rate of traverse and stop the test after 60 mm of the testpiece has been torn, i.e. at the termination line.
0bserve if the tear does not proceed along the direction of force and whether any threads slip out fromthe fabric rather than being torn.The test is to be considered correct if no slippage occurs in the jaws,no delamination takes place between coating and base fabric during the test and the tear proceededand was completed along the direction of application of the force. Other results shall be rejected unlessotherwise they are judged to be useful information at the users' discretion and to be recorded as aninformative value in the test report.
When testing on wet test pieces is required, remove the test piece from the water (in accordance withthe last paragraph in 7.1), press it tightly between two sheets of blotting paper and immediately carryout the test as described above.
lf three or more test pieces have to be rejected, consider the method as unsuitable.
ln this case, and if the test has been performed with normal test pieces, the tear resistance may beassessed either by using another method, e.g.IS0 4674-2, or by re-testing by the present method usinglarge test pieces as described in Annex B.
