Designation:D7238−06(Reapproved2012)StandardTestMethodforEffectofExposureofUnreinforcedPolyolefinGeomembraneUsingFluorescentUVCondensationApparatus1ThisstandardisissuedunderthefixeddesignationD7238;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisstandardcoversthespecificproceduresandtestconditionsthatareapplicableforexposureofunreinforcedpolyolefingeomembranestofluorescentUVradiationandcondensation.NOTE1—Polyolefingeomembranesincludehighdensitypolyethylene(HDPE),linearlowdensitypolyethylene(LLDPE),flexiblepolyproply-ene(fPP),etc.1.2TestspecimensareexposedtofluorescentUVA340lampsundercontrolledenvironmentalconditions.UVA340lampsarestandardforthismethod.NOTE2—OthertypesoffluorescentUVlamps,suchasUVB-313,canalsobeusedbasedupondiscussionbetweeninvolvedparties.However,ifthetestisranwithanothertypeoffluorescentUVlamps,suchasUVB-313,thisshouldbeconsideredasadeviationfromthestandardandclearlystatedinthetestreport.UVB-313andUVA-340fluorescentlampsgeneratedifferentamountofradiantpowerindifferentwavelengthranges;thus,thephotochemicaleffectscausedbythesedifferentlampsmayvary.1.3ThismethodcoverstheconditionsunderwhichtheexposureistobeperformedandthetestmethodsforevaluatingtheeffectsoffluorescentUV,heatandmoistureintheformofcondensationongeomembranes.GeneralguidanceisgiveninPracticesG151andG154.1.4ThevalueslistedinSIunitsaretoberegardedasthestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1238TestMethodforMeltFlowRatesofThermoplasticsbyExtrusionPlastometerD5885TestMethodforOxidativeInductionTimeofPoly-olefinGeosynthet...
