Designation:D5587−15(Reapproved2019)StandardTestMethodforTearingStrengthofFabricsbyTrapezoidProcedure1ThisstandardisissuedunderthefixeddesignationD5587;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofthetearingstrengthoftextilefabricsbythetrapezoidprocedureusingarecordingconstant-rate-of-extension-type(CRE)tensiletestingmachine.1.1.1TheCRE-typetensiletestingmachinehasbecomethepreferredtestapparatusfordeterminingtrapezoidtearingstrength.Itisrecognizedthatsomeconstant-rate-of-traverse-type(CRT)tensiletestingmachinescontinuetobeused.Consequently,thesetestinstrumentsmaybeusedwhenagreeduponbetweenthepurchaserandthesupplier.TheconditionsforuseoftheCRT-typetensiletesterareincludedinAppendixX1.1.2Thistestmethodappliestomostfabricsincludingwovenfabrics,airbagfabrics,blankets,nappedfabrics,knittedfabrics,layeredfabrics,pile,andnonwovenfabrics.Thefabricsmaybeuntreated,heavilysized,coated,resin-treated,orotherwisetreated.Instructionsareprovidedfortestingspecimenswithorwithoutwetting.1.3Tearingstrength,asmeasuredinthistestmethod,requiresthatthetearbeinitiatedbeforetesting.Thereportedvalueobtainedisnotdirectlyrelatedtotheforcerequiredtoinitiateorstartatear.1.4Twocalculationsfortrapezoidtearingstrengthareprovided:thesingle-peakforceandtheaverageoffivehighestpeakforces.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesstatedininch-poundunitsmaybeapproximate.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-iz...
