ASTM_D_7744_-_D_7744M_-_20.pdf

Designation:D7744/D7744M20Standard Test Methods forTensile Testing of High Performance Polyethylene Films1This standard is issued under the fixed designation D7744/D7744M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the tensile testing of highperformance polyethylene films.The methods include testingprocedure only and include no specifications or tolerances.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 includes the following test methods:SectionBreaking Force11Breaking Tenacity12Toughness at Break17Elongation at Break13Force at Specified Elongation(FASE)14Linear Density10Modulus15Work-to-Break161.4 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.1.5 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:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD883 Terminology Relating to PlasticsD1776 Practice for Conditioning and Testing TextilesD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD2258 Practice for Sampling Yarn for TestingD3800 Test Method for Density of High-Modulus FibersD4848 Terminology Related to Force,Deformation andRelated Properties of TextilesD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensD7269/D7269M Test Methods for Tensile Testing ofAramidYarnsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 high-performance polyethylene,na manufacturedfiber or film made of a polymer prepared by the polymerizationof ethylene as the sole monomer which has a minimum oftenacity at break of 20 gpd.3.1.1.1 DiscussionGeneralThe following acronyms areused to describe this category of fibers:UHMWPE Ultra high molecular weight polyethyleneHMPE High modulus polyethyleneHPPE High performance polyethyleneSpecificFor other definitions related to polyethylenerefer to Terminology D883.3.1.2 film,nin plastics,an optional term for sheetinghaving a nominal thickness not greater than 0.25 mm 0.01 in.3.2 For definitions of terms related to force and deformationin textiles,refer to Terminology D4848.3.3 The following terms are relevant to this standard:breaking force,breaking tenacity,elongation,force at specifiedelongation(FASE),force-elongation curve,force-extensioncurve,modulus,toughness at break,and work-to-break.3.4 For definitions of other terms related to textiles,refer toTerminology D123.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.19 on Industrial Fibers andMetallic Reinforcements.Current edition approved March 15,2020.Published April 2020.Originallyapproved in 2011.Last previous edition approved in 2011 as D7744/D7744M11.DOI:10.1520/D7744_D7744M-20.2For 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.4.Summary of Test Method4.1 A conditioned high performance polyethylene film isclamped in a constant rate of extension tensile testing machine(CRE)and then stretched or loaded until broken.4.2 Breaking force,elongation,and force at specified elon-gation(FASE)are determined directly.Modulus and work-to-break are calculated from the force-elongation curve.5.Significance and Use5.1 The levels o