【astm標(biāo)準(zhǔn)】g 152 - 13

1、Designation:G152?13StardPracticefOperatingOpenFlameCarbonArcLightApparatusfExposureofNonmetallicMaterials1ThisstardisissuedunderthefixeddesignationG152thenumberimmediatelyfollowingthedesignationindicatestheyearofiginalad

2、optioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thispracticecoversthebasicprinciplesoper

3、atingproceduresfusingopenflamecarbonarclightwaterapparatusintendedtoreproducetheweatheringeffectsthatoccurwhenmaterialsareexposedtosunlight(eitherdirectthroughwindowglass)moistureasraindewinactualuse.Thispracticeislimite

4、dtotheproceduresfobtainingmeasuringcontrollingconditionsofexposure.Anumberofexposureproceduresarelistedinanappendixhoweverthispracticedoesnotspecifytheexposureconditionsbestsuitedfthematerialtobetested.NOTE1—PracticeG151

5、describesperfmancecriteriafallexposuredevicesthatuselabatylightsources.ThispracticereplacesPracticeG23whichdescribesveryspecificdesignsfdevicesusedfcarbonarcexposures.TheapparatusdescribedinPracticeG23iscoveredbythisprac

6、tice.1.2Testspecimensareexposedtofilteredopenflamecarbonarclightundercontrolledenvironmentalconditions.Differentfiltersaredescribed.1.3Specimenpreparationevaluationoftheresultsarecoveredinmethodsspecificationsfspecificma

7、terials.GeneralguidanceisgiveninPracticeG151ISO48921.MespecificinfmationaboutmethodsfdeterminingthechangeinpropertiesafterexposurereptingtheseresultsisdescribedinPracticeD5870.1.4ThevaluesstatedinSIunitsaretoberegardedas

8、thestard.1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitations

9、pritouse.1.5.1Shouldanyozonebegeneratedfromtheoperationofthelightsourceitshallbecarriedawayfromthetestspecimensoperatingpersonnelbyanexhaustsystem.1.6ThispracticeistechnicallysimilartoISO48924.2.ReferencedDocuments2.1AST

10、MStards:2D3980PracticefInterlabatyTestingofPaintRelatedMaterials(Withdrawn1998)3D5870PracticefCalculatingPropertyRetentionIndexofPlasticsE691PracticefConductinganInterlabatyStudytoDeterminethePrecisionofaTestMethodG23Pra

11、cticefOperatingLightExposureApparatus(CarbonArcType)WithWithoutWaterfExposureofNonmetallicMaterials(Withdrawn2000)3G113TerminologyRelatingtoNaturalArtificialWeatheringTestsofNonmetallicMaterialsG151PracticefExposingNonme

12、tallicMaterialsinAcceleratedTestDevicesthatUseLabatyLightSources2.2CIEStard:CIEPubl.No.85:RecommendationsftheIntegratedIrradiancetheSpectralDistributionofSimulatedSolarRadiationfTestingPurposes42.3ISOStards:ISO48921Plast

13、ics—MethodsofExposuretoLabatyLightSourcesPart1GeneralGuidance4ISO48924Plastics—MethodsofExposuretoLabatyLightSourcesPart4OpenFlameCarbonArcLamp43.Terminology3.1Definitions—ThedefinitionsgiveninTerminologyG113areapplicabl

14、etothispractice.3.1.1AsusedinthispracticethetermsunlightisidenticaltothetermsdaylightsolarirradianceglobalastheyaredefinedinTerminologyG113.1ThispracticeisunderthejurisdictionofASTMCommitteeG03onWeatheringDurabilityisthe

15、directresponsibilityofSubcommitteeG03.03onSimulatedControlledExposureTests.CurrenteditionapprovedJuly12013.PublishedJuly2013.iginallyapprovedin1997.Lastpreviouseditionapprovedin2006asG152–06.DOI:10.1520G015213.2Freferenc

16、edASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Thelastapprovedversionofthishisticalstardisreferencedonwww

17、.astm.g.4AvailablefromAmericanNationalStardsInstitute(ANSI)25W.43rdSt.4thFloNewYkNY10036:www.ansi.g.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA

18、194282959.UnitedStates1attempttoprovidesimulationoftheshtwavelengthUVregionofdaylight.5ThedatainTable1isrepresentativeofthespectralirradiancereceivedbyatestspecimenmountedinthespecimenplaneofanopenflamecarbonarcequippedw

19、ithdaylightfilters.NOTE3—Thetypicalspectralirradiancefopenflamecarbonarcwithdaylightfilterswasobtainedusingabosilicateglassfilter.6.1.4.2SpectralIrradianceofOpenFlameCarbonArcWithWindowGlassFilters—Windowglassfiltersusea

20、heatresistantglasstofiltertheopenflamecarbonarcinasimulationofsunlightfilteredthroughsinglestrengthwindowglass.6ThedatainTable2isrepresentativeofthespectralirradiancereceivedbyatestspecimenmountedinthespecimenplaneofanop

21、enflamecarbonarcequippedwithwindowglassfilters.6.1.4.3SpectralIrradianceofOpenFlameCarbonarcWithExtendedUVfilters—FiltersthattransmitmeshtwavelengthUVaresometimesusedtoacceleratetestresults.Althoughthistypeoffilterhasbee

22、nspecifiedinmanytestsbecauseofhisticalprecedenttheytransmitsignificantradiantenergybelow300nm(thetypicalcutonwavelengthfterrestrialsunlight)mayresultinagingprocessesnotoccurringoutdos.5Thespectralirradiancefanopenflameca

23、rbonarcwithextendedUVfiltersshallcomplywiththerequirementsofTable3.NOTE4—ThemostcommonlyusedtypeofextendedUVfiltersaremadefromPotashLithiaglassarecommonlyknownasCexDfilters.6.2TestChamber—Thedesignofthetestchambermayvary

24、butitshouldbeconstructedfromcrosionresistantmaterialinadditiontotheradiationsourcemayprovidefmeansofcontrollingtemperaturerelativehuity.Whenrequiredprovisionshallbemadefthesprayingofwateronthetestspecimenfthefmationofcon

25、densateontheexposedfaceofthespecimen.6.2.1Theradiantsource(s)shallbelocatedwithrespecttothespecimenssuchthattheirradianceatthespecimenfacecomplieswiththerequirementsinPracticeG151.6.3InstrumentCalibration—Toensurestardiz

26、ationaccuracytheinstrumentsassociatedwiththeexposureapparatusfexampletimersthermometerswetbulbsenssdrybulbsensshuitysenssUVsenssradiometersrequireperiodiccalibrationtoensurerepeatabilityoftestresults.Wheneverpossiblecali

27、brationshouldbetraceabletonationalinternationalstards.Calibration5FischerR.KetolaW.MurrayW.“InherentVariabilityinAcceleratedWeatheringDevices”ProgressinganicCoatingsVol19(1991)pp.165–179.6KetolaW.RobbinsJ.S.“UVTransmissi

28、onofSingleStrengthWindowGlass”AcceleratedOutdoDurabilityTestingofganicMaterialsASTMSTP1202WarrenD.KetolaDouglasGrossmanEds.AmericanSocietyfTestingMaterialsPhiladelphia1993.TABLE2TypicalRelativeSpectralPowerDistributionfO

29、penFlameCarbonArcWithWindowGlassFilters(RepresentativeData)UltravioletWavelengthRegionIrradianceasaPercentageofTotalIrradiancefrom300to400nmBpass(nm)OpenFlameCarbonArcwithWindowGlassFiltersAEstimatedWindowGlassFilteredSu

30、nlightB250–2700%0%271–2900%0%291–3000%0%301–3202.1%0.1–1.5%321–3408.1%9.4–14.8%341–36013.2%23.2–23.5%361–38027.3%29.6–32.5%381–40049.3%30.9–34.5%UltravioletVisibleWavelengthRegionIrradianceasaPercentageofTotalIrradiancef

31、rom300to800nmCIrradianceasaPercentageofTotalIrradiancefrom300to800nmCBpass(nm)OpenFlameCarbonArcwithWindowGlassFiltersEEstimatedWindowGlassFilteredSunlightD300–40022.7–34.1%9.0–11.1%401–70051.1–67.3%71.3–73.1%Datafrom701

32、to800nmisnotshownACarbonArcData—Thisdataarefatypicalspectralpowerdistributionfanopenflamecarbonsarcwithwindowglassfilters.Notenoughspectraldataisavailablefmeaningfulanalysistodevelopaspecification.SubcommitteeG03.03iswki

33、ngtocollectsufficientdataindertodevelopaspecification.BSunlightData—Thesunlightdataisfglobalirradianceonahizontalsurfacewithanairmassof1.2columnozone0.294atmcm30%relativehuityaltitude2100m(atmosphericpressureof787.8mb)an

34、aerosolrepresentedbyanopticalthicknessof0.081at300nm0.62at400nm.TherangeisdeterminedbymultiplyingsolarirradiancebytheupperlowerlimitsftransmissionofsinglestrengthwindowglasssamplesusedfstudiesconductedbySubcommitteeG03.0

35、2.6CSunlightData—ThesunlightdataisfromTable4ofCIEPublicationNo.85globalsolarirradianceonahizontalsurfacewithanairmassof1.0columnozoneof0.34atmcm1.42cmprecipitablewatervapanaerosolrepresentedbyanopticalthicknessof0.1at500

36、nm.TABLE3RelativeSpectralPowerDistributionfOpenFlameCarbonArcwithExtendedUVFiltersABSpectralBpassWavelengthλinnmMinimumPercentCBenchmarkSolarRadiation–PercentDEFMaximumPercentCλ2904.9290#λ#3202.35.86.7320λ#36016.440.024.

37、3360λ#40068.154.280.1ADatainTable3aretheirradianceinthegivenbpassexpressedasapercentageofthetotalirradiancefrom250to400nm.ThemanufacturerisresponsiblefdeterminingconfmancetoTable3.AnnexA1stateshowtodeterminerelativespect

38、ralirradiance.BThedatainTable3arebasedontherectangularintegrationof24spectralpowerdistributionsfopenflamecarbonarcswithvariouslotsofcarbonrodsextendedUVfiltersofvariouslotsages.Thespectralpowerdistributiondataisffiltersw

39、ithintheagingrecommendationsofthedevicemanufacturer.Theminimummaximumdataareatleastthethreesigmalimitsfromthemeanfallmeasurements.CFanyindividualspectralpowerdistributionthecalculatedpercentagefthebpassesinTable1willsumt

40、o100%.Testresultscanbeexpectedtodifferbetweenexposuresusingopenflamecarbonarcdevicesinwhichthespectralpowerdistributionsdifferbyasmuchasthatallowedbythetolerancestypicalfdaylightfilters.Contactthemanufacturerofthecarbona

41、rcdevicesfspecificspectralpowerdistributiondataftheopenflamecarbonarcfiltersused.DTheASTMbenchmarksolarradiationdataisdefinedinASTMG177isfatmosphericconditionsaltitudechosentomaximizetheshtwavelengthUVfractionofsolarUV.T

42、hisdataisprovidedfcomparisonpurposesonly.EPreviousversionsofthisstardusedsolarradiationdatafromTable4ofCIEPublicationNumber85.SeeAppendixX2fmeinfmationcomparingthesolarradiationdatausedinthestardwiththatfCIE85Table4.FFth

43、ebenchmarksolarspectrumtheUVirradiance(290400nm)is9.8%thevisibleirradiance(400800nm)is90.2%expressedasapercentageofthetotalirradiancefrom290to800nm.ThepercentagesofUVvisibleirradiancesonsamplesexposedinfilteredopenflamec