Designation:D3874−20StandardTestMethodforIgnitionofMaterialsbyHotWireSources1ThisstandardisissuedunderthefixeddesignationD3874;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodisintendedtodifferentiate,inapreliminaryfashion,amongmaterialswithrespecttotheirresistancetoignitionbecauseoftheirproximitytoelectrically-heatedwiresandotherheatsources.21.2Thistestmethodappliestomoldedorsheetmaterialsavailableinthicknessesuptoandincluding13.0mm(0.51in.).1.3Thistestmethodappliestomaterialsthatarerigidorflexibleatnormalroomtemperatures.Itisimportanttominimizedeformationduringpreparation,especiallyduringthewire-wrappingstepdescribedin10.1,byfollowingthemethodoutlinedunderClause10,SamplePreparation.Ex-amplesofdeformationincludebowing,ineitheratransverseoralongitudinaldirection,twistingofthespecimen,andinden-tationofthewireintothespecimenduringthewire-wrappingstep,toadegreevisibletotheeye.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.(SeeSI10forfurtherdetails.)1.5Thistestmethodmeasuresanddescribestheresponseofmaterials,products,orassembliestoheatandflameundercontrolledconditions,butdoesnotbyitselfincorporateallfactorsrequiredforfirehazardorfireriskassessmentofthematerials,products,orassembliesunderactualfireconditions.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Firetestingisinherentlyhazardous.Adequatesafe-guardsforpersonnelandpropertyshallbeemployedinconductingthesetests.NOTE1—AlthoughthistestmethodandIECTS60695-2-20(with-drawn)diffe...
