ASTM D7142-05(2021)

5.1?Both test methods are considered satisfactory for acceptance testing of commercial shipments of garments with prong-ring type snap fasteners.

5.2?Comparison of results from test equipment operating on different principles is not recommended. In cases of conflict between the test results achieved with manual test equipment (Option 2) and motorized CRE (constant rate of extension) tensile testing machine (Option 1), the results from the motorized equipment shall take precedence.

5.3?This test method may be used to determine the compatibility of prong-ring type snap fasteners and fabrics for use in apparel. In which case, the fasteners are attached to the fabric in the manner in which they will be used and the combined units tested. See Annex A1.

1.1?This test method covers the determination of the holding strength of a prong-ring to the socket or stud of a snap fastener using a tensile testing machine (Option 1) or a manual test stand and force-measuring gage (Option 2).

1.2?This test method is applicable to prong-ring type snap fasteners in garments or to be attached to fabrics intended for use in apparel (see Annex A1).

1.3?The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.4?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.