ASTM_D_2653_-_07_2012.pdf

Designation:D265307(Reapproved 2012)Standard Test Method forTensile Properties of Elastomeric Yarns(CRE Type TensileTesting Machines)1This standard is issued under the fixed designation D2653;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 test method covers the determination of the tensileproperties of“as produced”elastomeric yarns made fromnatural rubber,spandex or other elastomers,using a constant-rate-of-extension(CRE)type tensile testing machine.Theproperties included in this test method are:(1)force at firstfilament break,(2)tenacity at first filament break,(3)elonga-tion at first filament break,(4)work to break at first filamentbreak,and(5)toughness at first filament break.1.2 This test method does not apply to covered,wrapped,orcore-spun yarns or yarns spun from elastomeric staple.1.3 This test method is applicable to elastomeric yarns in therange from 40 to 3200 dtex(36 to 2900 denier).1.4 The values stated in either SI units or U.S.Customaryunits are to be regarded separately as standard.Within the text,the U.S.Customary units are given in parentheses.The valuesstated in each system are not exact equivalents;therefore,eachsystem shall be used independently of the other.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2258 Practice for Sampling Yarn for TestingD2591 Test Method for Linear Density of Elastomeric Yarns(Short Length Specimens)D4848 Terminology Related to Force,Deformation andRelated Properties of TextilesD4849 Terminology Related to Yarns and FibersD6717 Test Method for Linear Density of Elastomeric Yarns(Skein Specimens)3.Terminology3.1 For all terminology relating to D13.58,Yarns andFibers,refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:elastomeric yarn,elongation,force,linear density,tenacity,toughness,work,work to break.3.2 For definitions of other terms related to force anddeformation,refer to Terminology D4848.For all other termi-nology related to textiles,refer to Terminology D123.4.Summary of Test Method4.1 A specimen is clamped in a CRE-type tensile testingmachine and extended to rupture.Force at first filament breakand elongation at first filament break,work and toughness arecalculated from a force-elongation curve or with an interfacedcomputer.Tenacity at first filament break can be calculatedbased on the determined linear density of the yarn.Otherproperties,such as force at specified elongation(FASE),elongation at specified force(EASF),may also be calculated.5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commercial shipments since current estimatesof between-laboratory precision are acceptable and the methodis used extensively in the trade for acceptance testing.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative tests should be performed to determine if there isa statistical bias between them,using competent statisticalassistance.As a minimum,use samples for such comparativetests that are as homogeneous as possible,drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing,and randomly assigned in equal numbersto each laboratory.The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data,at a probability level chosen prior to the testing1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1967.Discontinued 1979 and reinstated as D2653 79.Last previousedition approved in 2007 as D265307.DOI:10.1520/D2653-07R12.2For 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 States1 series.If bias is found,either its cause must be found andcorrected,or future test results for that material must beadjusted in consideration of the known bias.5.2 The force at first filament break of elastomeric yarnsmay depen