Designation:D635−22StandardTestMethodforRateofBurningand/orExtentandTimeofBurningofPlasticsinaHorizontalPosition1ThisstandardisissuedunderthefixeddesignationD635;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisfire-test-responsetestmethodcoversasmall-scalelaboratoryscreeningprocedureforcomparingtherelativelinearrateofburningorextentandtimeofburning,orboth,ofplasticsintheformofbars,moldedorcutfromsheets,plates,orpanels,andtestedinthehorizontalposition.NOTE1—Thistestmethod,andtestmethodAofIEC60695-11-10aretechnicallyequivalent.NOTE2—Foradditionalinformationonmaterialswhichdonotburntothefirstreferencemarkbythistest,seeTestMethodD3801.1.2Thistestmethodwasdevelopedforpolymericmaterialsusedforpartsindevicesandappliances.Theresultsareintendedtoserveasapreliminaryindicationoftheiraccept-abilitywithrespecttoflammabilityforaparticularapplication.Thefinalacceptanceofthematerialisdependentuponitsuseincompleteequipmentthatconformswiththestandardappli-cabletosuchequipment.1.3TheclassificationsystemdescribedinAppendixX1isintendedforqualityassuranceandthepreselectionofcompo-nentmaterialsforproducts.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandardisusedtomeasureanddescribetheresponseofmaterials,products,orassembliestoheatandflameundercontrolledconditions,butdoesnotbyitselfincorporateallfactorsrequiredforfirehazardsorfireriskassessmentofmaterials,products,orassembliesunderactualfireconditions.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregu...
