Designation:D2457−21StandardTestMethodforSpecularGlossofPlasticFilmsandSolidPlastics1ThisstandardisissuedunderthefixeddesignationD2457;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethoddescribesproceduresforthemeasure-mentofglossofplasticfilmsandsolidplastics,bothopaqueandtransparent.Itcontainsfourseparateglossangles(Note1):1.1.160-deg,recommendedforintermediate-glossfilms,1.1.220-deg,recommendedforhigh-glossfilms,1.1.345-deg,recommendedforintermediateandlow-glossfilms,1.1.485-deg,recommendedforintermediateandlowglossfilms,and1.1.575-deg,recommendedforplasticsidingandsoffit.NOTE1—The85-deg,75-deg,60-deg,and20-degapparatusandmethodofmeasurementduplicatethoseinTestMethodD523andD3679;thoseforthe45°procedurearesimilarlytakenfromTestMethodC346.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE2—ThereisnoknownISOequivalenttothisstandard.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C346TestMethodfor45-degSpecularGlossofCeramicMaterialsD523TestMethodforSpecularGlossD3679SpecificationforRigidPoly(VinylChloride)(PVC)SidingE284TerminologyofAppearanceE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodE1347TestMethodforColorandColor-DifferenceMea-surementbyTristimulusColorimetryE1349TestMethodforReflectanceFactorandColorbySpectropho...
