Designation:D2256/D2256M−10(Reapproved2015)StandardTestMethodforTensilePropertiesofYarnsbytheSingle-StrandMethod1ThisstandardisissuedunderthefixeddesignationD2256/D2256M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationoftensilepropertiesofmonofilament,multifilament,andspunyarns,eithersingle,plied,orcabledwiththeexceptionofyarnsthatstretchmorethan5.0%whentensionisincreasedfrom0.05to1.0cN/tex[0.5to1.0gf/tex].1.2Thistestmethodcoversthemeasurementofbreakingforceandelongationofyarnsandincludesdirectionsforthecalculationofbreakingtenacity,initialmodulus,chordmodulus,andbreakingtoughness.1.2.1Optionsareincludedforthetestingofspecimensin:(A)straight,(B)knotted,and(C)loopedform.1.2.2Conditionsoftestareincludedforthetestingofspecimensthatare:(1)conditionedair,(2)wet,notimmersed,(3)wet,immersed,(4)oven-dried,(5)exposedtoelevatedtemperature,or(6)exposedtolowtemperature.NOTE1—Specialmethodsfortestingyarnsmadefromspecificfibers;namely,glass,flax,hemp,ramie,andkraftpaperandforspecificproducts;namely,tirecordsandrope,havebeenpublished:TestMethodsD885,andSpecificationD578.NOTE2—FordirectionscoveringthedeterminationofbreakingforceofyarnbytheskeinmethodrefertoTestMethodD1578.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimit...
