Designation:E2257−17AnAmericanNationalStandardStandardTestMethodforRoomFireTestofWallandCeilingMaterialsandAssemblies1ThisstandardisissuedunderthefixeddesignationE2257;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisisafire-test-responsestandard.1.2Thistestmethodisintendedtoevaluate,underspecifiedfire-exposureconditions,thecontributiontoroomfiregrowthprovidedbywallorceilingmaterialsandassemblies,orboth.Themethodisnotintendedtoevaluatethefireenduranceofassembliesorfiresoriginatinginthewallassembly.Themethodprovidesameanstoevaluatetheeffectivenessofthermalbarriersinrestrictingthecontributionofcombustiblematerialsinthewallassemblytofiregrowthinaroomfire.1.3Thistestmethod,simulatingafireinthecornerofa2420by3630mm(8by12ft)roomcontainingasingleopendoorway,providesameanstoevaluatetherelativeperfor-manceofspecifiedwallandceilingmaterialsorassemblieswhentheyareusedtogetherinthesamerelationshipwithinanenclosure,andsimulatingthemannerinwhichtheywillbeused.1.4Thistestmethodisintendedtoevaluatethecontributiontofiregrowthprovidedbyasurfaceproductusingaspecifiedignitionsource.Itshall,however,benotedthatthetype,positionandheatoutputoftheignitionsourcewillconsider-ablyinfluencefiregrowth.Thethermalexposureconditionsfromtheignitionsourcespecifiedinthismethodwillresultinflashoverduringthe20mindurationformanycommonfinishmaterials,inparticularifspecimensaremountedonthewallsandtheceiling(standardconfiguration).1.5Thistestmethodprovidesameansforevaluatingwallandceilingfinishmaterialsandassemblies,includingpanels,tiles,boards,sprayedorbrushedcoatings,etc.Thistestmethodisnotintendedtoevaluateflooringmaterialsorfurnishings.1.6ThismethodshallbeusedinconjunctionwithGuideE603,whichcoversinstrumentationandthegeneraleffectofvariousparameters,andGuideE2067,whichdealswithful...
