Designation:D1474/D1474M−13StandardTestMethodsforIndentationHardnessofOrganicCoatings1ThisstandardisissuedunderthefixeddesignationD1474/D1474M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthedeterminationoftheindentationhardnessoforganicmaterialssuchasdriedpaint,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.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D823PracticesforProducingFilmsofUniformThicknessofPaint,Varnish,andRelatedProductsonTestPanelsD1005TestMethodforMeasurementofDry-FilmThick-nessofOrganicCoatingsUsingMicrometersD7091PracticeforNondestructiveMeasurementofDryFilmThicknessofNonmagneticCoatingsAppliedtoFerrousMetalsandNonmagnetic,NonconductiveCoat-in...
