Designation:G153−13StandardPracticeforOperatingEnclosedCarbonArcLightApparatusforExposureofNonmetallicMaterials1ThisstandardisissuedunderthefixeddesignationG153;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversthebasicprinciplesandoperatingproceduresforusingenclosedcarbon-arclightandwaterapparatusintendedtoreproducetheweatheringeffectsthatoccurwhenmaterialsareexposedtosunlight(eitherdirectorthroughwindowglass)andmoistureasrainordewinactualuse.Thispracticeislimitedtotheproceduresforobtaining,measuring,andcontrollingconditionsofexposure.Anumberofexposureproceduresarelistedinanappendix;however,thispracticedoesnotspecifytheexposureconditionsbestsuitedforthematerialtobetested.NOTE1—PracticeG151describesperformancecriteriaforallexposuredevicesthatuselaboratorylightsources.ThispracticereplacesPracticeG23,whichdescribesveryspecificdesignsfordevicesusedforcarbon-arcexposures.TheapparatusdescribedinPracticeG23iscoveredbythispractice.1.2Testspecimensareexposedtoenclosedcarbonarclightundercontrolledenvironmentalconditions.1.3Specimenpreparationandevaluationoftheresultsarecoveredinvariousmethodsorspecificationsforspecificmaterials.GeneralguidanceisgiveninPracticeG151andISO4892-1.Morespecificinformationaboutmethodsfordeter-miningthechangeinpropertiesafterexposureandreportingtheseresultsisdescribedinISO4582.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.5.1Shouldanyozonebegeneratedfromtheoperationofthelightsource,itshallbecarriedawayfromthetestspecimensandoperatingpersonnelbyanexhaustsystem.2.Re...
