Designation:D7334−08(Reapproved2022)StandardPracticeforSurfaceWettabilityofCoatings,SubstratesandPigmentsbyAdvancingContactAngleMeasurement1ThisstandardisissuedunderthefixeddesignationD7334;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversthemeasurementoftheangleofcontactwhenadropofliquidisappliedtoacoatedsurface,substrate,orpreformeddiskofpigment.1.2Therearetwotypesofcontactangles,advancingandreceding.Thisstandarddealsonlywithadvancingcontactangles.1.3Thispracticeisintendedtosupplementthemanufactur-er’sinstructionsforthedevicebeingusedtomakethemeasurements,butisnotintendedtoreplacethem.1.4Acommontestliquidiswater,butmanyotherliquidssuchassolvents,surfactantanddispersantsolutionsandevenliquidpaintscanbeused.1.5Thispracticeisbasedongoniometry,whichinvolvestheobservationofasessiledropoftestliquidonasolidsubstrate.1.6Althoughcontactanglesaregovernedbysurfacetension,thisstandardcannotbeusedtomeasuresurfacetensiondirectly.1.7ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.9Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD5725TestMethodforSurfaceWettabilityandAbsorbencyofSheetedMaterialsUsinganAutomatedContactAngleTester(Withdra...
