Designation:D4956−13StandardSpecificationforRetroreflectiveSheetingforTrafficControl1ThisstandardisissuedunderthefixeddesignationD4956;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoversflexible,non-exposedglassbeadlensandmicroprismatic,retroreflectivesheetingdesignedforuseontrafficcontrolsigns,delineators,barricades,andotherdevices.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thefollowingsafetyhazardscaveatpertainsonlytothetestmethodsportion,Section7,ofthisspecification.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B209SpecificationforAluminumandAluminum-AlloySheetandPlateB209MSpecificationforAluminumandAluminum-AlloySheetandPlate(Metric)B449SpecificationforChromatesonAluminumE284TerminologyofAppearanceE308PracticeforComputingtheColorsofObjectsbyUsingtheCIESystemE808PracticeforDescribingRetroreflectionE810TestMethodforCoefficientofRetroreflectionofRetroreflectiveSheetingUtilizingtheCoplanarGeometryE811PracticeforMeasuringColorimetricCharacteristicsofRetroreflectorsUnderNighttimeConditionsE991PracticeforColorMeasurementofFluorescentSpeci-mensUsingtheOne-MonochromatorMethodE1164PracticeforObtainingSpectrometricDataforObject-ColorEvaluationE1247PracticeforDetectingFluorescenceinObject-ColorSpecimensbySpectrophotometryE1347TestMethodforColorandColor-DifferenceMea-surementbyTristimulusColorimetr...
