Designation:C1371−15StandardTestMethodforDeterminationofEmittanceofMaterialsNearRoomTemperatureUsingPortableEmissometers1ThisstandardisissuedunderthefixeddesignationC1371;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversatechniquefordeterminationoftheemittanceofopaqueandhighlythermallyconductivematerialsusingaportabledifferentialthermopileemissometer.Thepurposeofthetestmethodistoprovideacomparativemeansofquantifyingtheemittanceofmaterialsnearroomtemperature.1.2ThistestmethoddoesnotsupplantTestMethodC835,whichisanabsolutemethodfordeterminationoftotalhemi-sphericalemittance,orTestMethodE408,whichincludestwocomparativemethodsfordeterminationoftotalnormalemit-tance.Becauseoftheuniqueconstructionoftheportableemissometer,itcanbecalibratedtomeasurethetotalhemi-sphericalemittance.ThisissupportedbycomparisonofemissometermeasurementswiththoseofTestMethodC835(1).21.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3C168TerminologyRelatingtoThermalInsulationC680PracticeforEstimateoftheHeatGainorLossandtheSurfaceTemperaturesofInsulatedFlat,Cylindrical,andSphericalSystemsbyUseofComputerProgramsC835TestMethodforTotalHemisphericalEmittanceofSurfacesupto1400°CE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE408TestMethodsforTotalNormalEmittanceofSurfacesUsingInspection-MeterTechniquesE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions—Fordefinitio...
