Designation:D7897−18StandardPracticeforLaboratorySoilingandWeatheringofRoofingMaterialstoSimulateEffectsofNaturalExposureonSolarReflectanceandThermalEmittance1ThisstandardisissuedunderthefixeddesignationD7897;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1PracticeD7897appliestosimulationoftheeffectsoffieldexposureonthesolarreflectanceandthermalemittanceofroofsurfacematerialsincludingbutnotlimitedtofield-appliedcoatings,factory-appliedcoatings,single-plymembranes,modifiedbitumenproducts,shingles,tiles,andmetalproducts.Thesolarreflectanceandthermalemittanceofroofsurfacingmaterialscanbechangedbyexposuretotheoutdoorenviron-ment.Thesechangesarecausedbythreefactors:depositionandretentionofairbornepollutants;microbiologicalgrowth;andchangesinphysicalorchemicalproperties.Thispracticeappliestosimulationofchangesinsolarreflectanceandthermalemittanceinducedbydepositionandretentionofairbornepollutantsand,toalimitedextent,changescausedbymicrobiologicalgrowth.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C1371TestMethodforDeterminationofEmittanceofMaterialsNearRoomTemperatureUsingPortableEmis-sometersC1549TestMethodforDeterminationofSolarReflectanceNearAmbientTemperatureUsingaPortableSolarReflec-tometerE691PracticeforConductinganInterl...
