ASTM D5034-21 pdf free download.Standard Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test).
1.1 This test method covers the grab and modified grab test procedures for determining the breaking strength and elongation of most textile fabrics. Provisions are made for wet testing.
1.1.1 The grab test procedure is applicable to woven, nonwoven. and fclted fabrics, while the modified grab test procedure is used primarily for woven fabrics.
1.2 This test method is not recommended for glass fabrics, or for knitted fabrics and other textile fabrics which have high stretch (more than 11 %).
5. Significance and Use
5.1 The grab test procedure in this test method for the determination of breaking force and elongation is considered satisfactory for acceptance testing of commercial shipments of most woven or nonwoven textile fabrics, and the modified grab test procedure is considered satisfactory for acceptance testing of commercial shipments of most woven textile fabrics, since the procedures have been used extensively in the trade for acceptance testing.
5.1.1 In case of disagreement arising from differences in reported test values when using this test method for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student’s 1-test for unpaired data and an acceptable probability level chosen by the two parties before testing is begun. If a bias is found. either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results in light of the known bias.
5.2 This test method is fbi recommended for knitted fabrics because of their high stretch.
5.3 Some modification of technique may be necessary for any fabric having a strength in excess of 200-N/cm (1140-Ib/ in.) width. Special precautionary measures are provided for use when necessary for strong fabrics.
5.4 All of the procedures are applicable for testing fabrics either conditioned or wet.ASTM D5034 pdf download.