ASTM_D_3657_-_03_2021.pdf

Designation:D365703(Reapproved 2021)Standard Specification forZipper Dimensions1This standard is issued under the fixed designation D3657;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification establishes standard dimensions forzippers of all materials for specified size designation;forequivalency,in inch-pound and metric units,of zipper lengthand length tolerances,of tape width and width tolerances,andof tape end lengths.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory 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 theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD2050 Terminology Relating to Subassemblies Used in theManufacture of TextilesD2060 Test Methods for Measuring Zipper Dimensions3.Terminology3.1 Definitions:3.1.1 For definitions of zipper terms used in this standard,refer to Terminology D2050.For definitions of other textileterminology used in this standard refer to Terminology D123.4.Sampling4.1 Sample the lot and select the number of specimens asdirected in Test Methods D2060.5.Dimensions and Permissible Variations5.1 Zippers shall conform to the dimensions listed in Tables1-4.5.2 Tables 2 and 3 include tolerances which represent tradepractice and are in common use.The tolerances are not uniformbetween sizes because of differing requirements of the zippersbased on their normal end-use.5.3 Table 2,within a size,has uniform plus tolerances.Minus tolerances increase nonuniformly with increasing lengthbecause 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 ofelements with a prescribed pitch and each element must remaincomplete to function,it is impossible to manufacture a zipperdeliberately to an exact stated length.Therefore a shipment ofzippers of a stated length will not likely average the statedlength.Both the lot average length and the length of individualzippers should fall within the tolerances in Table 2.5.4 Table 4 shows the metric conversion for standardinch-pound unit tape end lengths.Tape end length tolerancesare not shown due to widely varying end-use requirements andinherent zipper manufacturing dimension variations.Toler-ances to be observed should be agreed upon between purchaserand supplier.6.Test Methods6.1 SizeDetermine the zipper size as directed in the mouthwidth procedure of Test Methods D2060.6.2 Zipper LengthDetermine the zipper length as directedin the length of completely assembled zipper procedure of TestMethods D2060.6.3 Tape WidthDetermine the zipper tape width as di-rected in the tape width procedure of Test Methods D2060.1This specification is under the jurisdiction of ASTM Committee D13 onTextiles and is the direct responsibility of Subcommittee D13.54 on Subassemblies.This specification was developed in cooperation with the Slide Fastener and ClosureAssociation.Current edition approved July 1,2021.Published August 2021.Originallyapproved in 1978.Last previous edition approved in 2014 as D3657 03(2014).DOI:10.1520/D3657-03R21.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.16.4 Tape End LengthDetermine the zipper tape end lengthas directed in the length of tape end procedure of Test MethodsD2060.7.Conformance7.1 Material that fails to