Designation:D1746−15StandardTestMethodforTransparencyofPlasticSheeting1ThisstandardisissuedunderthefixeddesignationD1746;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthemeasurementofthetrans-parencyofplasticsheetingintermsofregulartransmittance(Tr).Althoughgenerallyapplicabletoanytranslucentortransparentmaterial,itisprincipallyintendedforusewithnominallyclearandcolorlessthinsheeting.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.NOTE2—Foradditionalinformation,seeTerminologyE284andPrac-ticeE1164.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD883TerminologyRelatingtoPlasticsD1003TestMethodforHazeandLuminousTransmittanceofTransparentPlasticsE284TerminologyofAppearanceE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodE1164PracticeforObtainingSpectrometricDataforObject-ColorEvaluationE1316TerminologyforNondestructiveExaminationsE1345PracticeforReducingtheEffectofVariabilityofColorMeasurementbyUseofMultipleMeasurementsE1347TestMethodforColorandColor-DifferenceMea-surementbyTristimulusColorimetryE1348TestMethodforTransmittanceandColorbySpec-trophotometryUsingHemisphericalGeometry3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthistestmethod,refertoTerminologiesD883,E284,andE1316.4.SignificanceandUse4.1Theattributeofclarityofasheet,meas...
