Designation:D1474/D1474M−13(Reapproved2018)StandardTestMethodsforIndentationHardnessofOrganicCoatings1ThisstandardisissuedunderthefixeddesignationD1474/D1474M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationoftheindentationhardnessoforganicmaterialssuchasdriedpaint,varnish,andlacquercoatings,whenappliedtoanacceptableplanerigidsurface,forexample,metalorglass.1.2Twomethodsarecoveredasfollows:SectionsMethodA—KnoopIndentationHardness6–12MethodB—PfundIndentationHardness13–191.3MethodA,whichhasthegreaterprecision,provideshardnessvaluesintermsofKnoopHardnessNumber(KHN).MethodBprovideshardnessintermsofPfundHardnessNumber(PHN).Althoughthehardnessvaluescalesofthesemethodsdiffer,themethodsagreeintherankingofcoatinghardness.1.4TestMethodAofthesetestmethodsissimilarincontent(butnottechnicallyequivalent)toISO6441-1andISO6441-2.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalpracticesanddeterminetheappli-cabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandard...
