Designation:D4032−08(Reapproved2016)StandardTestMethodforStiffnessofFabricbytheCircularBendProcedure1ThisstandardisissuedunderthefixeddesignationD4032;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthestiff-nessoffabricsbythecircularbendprocedure.1.2Thistestmethodisgenerallyapplicabletoalltypesoffabrics,includingwoven,knittedandnonwovens,ofanyfibercontent.NOTE1—Forothermethodsoftestingforstiffness,refertoTestMethodsD1388.1.3ThevaluesstatedinSIunitsaretobeconsideredasstandard;thevaluesininch-poundunitsareincludedforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1388TestMethodforStiffnessofFabricsD1776/D1776MPracticeforConditioningandTestingTex-tilesD4850TerminologyRelatingtoFabricsandFabricTestMethods3.Terminology3.1ForallterminologyrelatingtoD13.60,FabricTestMethods,Specific,refertoTerminologyD4850.3.1.1Thefollowingtermsarerelevanttothisstandard:circularbend,stiffness.3.2Forallotherterminologyrelatedtotextiles,seeTermi-nologyD123.4.SummaryofTestMethod4.1Aplungerforcesaflat,foldedswatchoffabricthroughanorificeinaplatform.Themaximumforcerequiredtopushthefabricthroughtheorificeisanindicationofthefabricstiffness(resistancetobending).5.SignificanceandUse5.1TestMethodD4032fortestingstiffnessoffabricsisconsideredsatisfactoryforqualitycontroltesting.Itmayalsobeusedforacceptancetestingofcommercialshipmentssincethetestmethodhasbeenusedextensivelyinthetradefield.IncasesofdifferencesinvaluesreportedbypurchaserandsellerusingTestMethodD4032for...
