Designation:F2298−03(Reapproved2009)´1StandardTestMethodsforWaterVaporDiffusionResistanceandAirFlowResistanceofClothingMaterialsUsingtheDynamicMoisturePermeationCell1ThisstandardisissuedunderthefixeddesignationF2298;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.´1NOTE—ReapprovedwitheditorialchangesinFebruary2009.1.Scope1.1Thistestmethodcoversthemeasurementofthemois-turevaportransportandgasflowpropertiesoffabrics,membranes,andmembranelaminatesusedforprotectivematerials.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D737TestMethodforAirPermeabilityofTextileFabrics2.2OtherStandards:ISO11092Textiles—PhysiologicalEffects—MeasurementofThermalandWater-VapourResistanceUnderSteady-StateConditions(SweatingGuarded-HotplateTest)3JISL1099TestingMethodsforWaterVapourPermeabilityofClothes33.Terminology3.1Definitions:3.1.1watervapordiffusion,n—theprocessbywhichwatervapormoleculesmovefromaregionofhighconcentrationtoaregionoflowconcentration.3.1.2watervaportransmissionrate,n—thesteadywatervaporflowinunittimethroughunitareaofamaterial,underspecificconditionsoftemperatureandhumidityateachsur-face.4.SummaryofTestMethods4.1Thetestingoutlinedinthisstandardconsistsofmeasur-ingtheamountofwatervaportransportacrossaspecimen.Thewatervaportransportpropertiescanbemeasuredinapurediffusionmodeandinadiffusion/convectionmode.4.2Twotestmethodsarepresentedinthisstandard:4.2.1PartA(DiffusionTest)—Thetestisdoneunderthemaximumdifferenceinrelativehumidityandzeropressuregradientacrossthespecimensothaton...
