ASTM D3657-03(R2021) pdf free download

ASTM D3657-03(R2021) pdf free download.Standard Specification for Zipper Dimensions
1. Scope
1.1 This specification establishes standard dimensions for zippers of all materials for specified size designation; for equivalency, in inch-pound and metric units, of zipper length and length tolerances, of tape width and width tolerances, and of tape end lengths. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Dimensions and Permissible Variations
5.1 Zippers shall conform to the dimensions listed in Tables 1-4. 5.2 Tables 2 and 3 include tolerances which represent trade practice and are in common use. The tolerances are not uniform between sizes because of differing requirements of the zippers based on their normal end-use. 5.3 Table 2, within a size, has uniform plus tolerances. Minus tolerances increase nonuniformly with increasing length because that is accepted trade practice based on the require- ments of the end products in which the zippers are installed. 5.3.1 Because zipper chain is composed of a series of elements with a prescribed pitch and each element must remain complete to function, it is impossible to manufacture a zipper deliberately to an exact stated length. Therefore a shipment of zippers of a stated length will not likely average the stated length. Both the lot average length and the length of individual zippers should fall within the tolerances in Table 2. 5.4 Table 4 shows the metric conversion for standard inch-pound unit tape end lengths. Tape end length tolerances are not shown due to widely varying end-use requirements and inherent zipper manufacturing dimension variations. Toler- ances to be observed should be agreed upon between purchaser and supplier.
6. Test Methods
6.1 Size—Determine the zipper size as directed in the mouth width procedure of Test Methods D2060. 6.2 Zipper Length—Determine the zipper length as directed in the length of completely assembled zipper procedure ofTest Methods D2060. 6.3 Tape Width—Determine the zipper tape width as di- rected in the tape width procedure of Test Methods D2060.6.4 Tape End Length—Determine the zipper tape end length as directed in the length of tape end procedure ofTest Methods D2060.
7. Conformance
7.1 Material that fails to conform to the requirements of this specification may be rejected. Rejection shall be reported to the producer or supplier promptly and in writing. In case of dissatisfaction with the results of the test, the producer or supplier may make claim for a rehearing. The terms of the rehearing shall be as agreed upon by the purchaser and the supplier.
8. Keywords
8.1 dimensions; specifications; zippers