Designation:D5235−18StandardTestMethodforMicroscopicMeasurementofDryFilmThicknessofCoatingsonWoodProducts1ThisstandardisissuedunderthefixeddesignationD5235;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofdryfilmthicknessofcoatingsappliedtoasmooth,texturedorcurvedrigidsubstrateofwoodorawood-basedproduct.1.2Thistestmethodcoversthepreparationofwoodorwood-basedspecimensforthepurposeofmicroscopicmea-surementofdryfilmthickness.1.3Thistestmethodsuggestsananalysisofdryfilmthicknessofcoatingsonwoodorwood-basedproductsusingamicroscopicmeasurement.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1dryfilmthicknessorDFT,n—thethicknessofdried,curedcoatingfilmonthesubstratesurfacewhichmayincludeattachedfibersbutexcludesfreefibersthatareencap...
