Designation:D6490−99(Reapproved2022)StandardTestMethodforWaterVaporTransmissionofNonFilmFormingTreatmentsUsedonCementitiousPanels1ThisstandardisissuedunderthefixeddesignationD6490;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftherateatwhichwatervaporpassesthroughnonfilmformingtreatments,suchassilanes,siloxanesandblendsofsilanes/siloxanesappliedtocementitioussubstrates.1.2Thistestmethodcoverstheuseofthewetcuptechnique,whichmostcloselyapproachestheexteriorcondi-tionsforuseforthesematerials.Otherconditionscanbeusedifagreeduponbetweenpurchaserandsupplier.Agreementshouldnotbeexpectedbetweenresultsobtainedbydifferentmethodsortestconditions.1.3ThevaluesstatedinSIunitsofmeasurementaredesignatedasthestandard.Factorsforconversiontoinch-poundunitsaregivenin9.2.1.1and9.2.2.1.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D823PracticesforProducingFilmsofUniformThicknessofPaint,CoatingsandRelatedProductsonTestPanelsD1193SpecificationforReagentWaterD1734PracticeforMakingCementitiousPanelsforTestingCoatingsD3924SpecificationforStandardEnvironmentforCondi-tioningandTestingPaint,Varnish,Lacquer,andRelatedMaterialsE104PracticeforMaintainingConstantRelativeHumiditybyMeansofAqueousSolutions3.SummaryofTest...
