Designation:D2261−13StandardTestMethodforTearingStrengthofFabricsbytheTongue(SingleRip)Procedure(Constant-Rate-of-ExtensionTensileTestingMachine)1ThisstandardisissuedunderthefixeddesignationD2261;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthemeasurementofthetearingstrengthoftextilefabricsbythetongue(singlerip)procedureusingarecordingconstant-rate-of-extension-type(CRE)ten-siletestingmachine.1.1.1TheCRE-typetensiletestingmachinehasbecomethepreferredtestapparatusfordeterminingtonguetearingstrength.Itisrecognizedthatsomeconstant-rate-of-traverse-type(CRT)tensiletestingmachinescontinuetobeused.Asaconsequence,thesetestinstrumentsmaybeusedwhenagreeduponbetweenthepurchaserandthesupplier.TheconditionsforuseoftheCRT-typetensiletesterareincludedinAppendixX1.1.2Thistestmethodappliestomostfabricsincludingwovenfabrics,airbagfabrics,blankets,nappedfabrics,knitfabrics,layeredfabrics,pilefabricsandnon-wovens.Thefabricsmaybeuntreated,heavilysized,coated,resin-treated,orotherwisetreated.Instructionsareprovidedfortestingspecimenswithorwithoutwetting.1.3Tearstrength,asmeasuredinthistestmethod,requiresthatthetearbeinitiatedbeforetesting.Thereportedvalueobtainedisnotdirectlyrelatedtotheforcerequiredtoinitiateorstartatear.1.4Twocalculationsfortonguetearingstrengtharepro-vided:thesingle-peakforceandtheaverageoffivehighestpeakforces.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedasthestandard.Theinch-poundunitsmaybeapproximate.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationsprior...
