Designation:D3833/D3833M−96(Reapproved2011)StandardTestMethodforWaterVaporTransmissionofPressure-SensitiveTapes1ThisstandardisissuedunderthefixeddesignationD3833/D3833M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcoversoneprocedureformeasuringthewatervaportransmissionrateofpressure-sensitivetape.1.2ThevaluesstatedineitherSIorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemmustbeusedindependently,withoutcombiningvaluesinanyway.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D996TerminologyofPackagingandDistributionEnviron-mentsD3715/D3715MPracticeforQualityAssuranceofPressure-SensitiveTapesD4332PracticeforConditioningContainers,Packages,orPackagingComponentsforTestingE96/E96MTestMethodsforWaterVaporTransmissionofMaterialsE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcess3.Terminology3.1Definitions—Generaltermsinthistestmethodarede-finedinTerminologyD996.4.SummaryofTestMethod4.1Thepressure-sensitivetapeissecuredbyitsadhesivetoatestcupcontainingadesiccant.Theassemblyisexposedtoacontrolledatmosphereandweighedaftertwointervalsofthatexposure.Thegaininweightisusedtocalculatethewatervaportransmissionrate(WVTR).5.SignificanceandUse5.1Theresultsofthistestmethodwillindicatetherelativepermeabilitybywatervaporofthetapethroughitssmallestdimension(generallynormaltothetape’sbacking).5.1.1Thepathwayforthewatervapo...
