Designation:D1494−17AnAmericanNationalStandardStandardTestMethodforDiffuseLightTransmissionFactorofReinforcedPlasticsPanels1ThisstandardisissuedunderthefixeddesignationD1494;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthediffuselighttransmissionfactoroftranslucentreinforcedplasticsbuildingpanels.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgivenintheparenthesesareforinforma-tiononly.1.3Thetextofthisstandardreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseinTablesandFigures)shallnotbeconsideredasrequirementsofthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1600TerminologyforAbbreviatedTermsRelatingtoPlas-ticsE2935PracticeforConductingEquivalenceTestinginLaboratoryApplicationsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ASTMAdjuncts:TestCabinetforDiffuseLightTransmissionFactorofReinforcedPanels33.Terminology3.1General—DefinitionsareinaccordancewithTerminol-ogyD883andab...
