Designation:D968−17StandardTestMethodsforAbrasionResistanceofOrganicCoatingsbyFallingAbrasive1ThisstandardisissuedunderthefixeddesignationD968;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthedeterminationoftheresistanceoforganiccoatingstoabrasionproducedbyabrasivefallingontocoatingsappliedtoaplanerigidsurface,suchasametalorglasspanel.1.2Twotestmethodsbasedondifferentabrasivesarecoveredasfollows:SectionsMethodA—FallingSandAbrasionTest6–13MethodB—FallingSiliconCarbideAbrasionTest14–211.3Thesemethodsshouldberestrictedtotestinginonlyonelaboratorywhennumericalvaluesareusedbecauseofthepoorreproducibilityofthemethods(see13.1.2and21.1.2).Interlaboratoryagreementisimprovedsignificantlywhenrank-ingisusedinplaceofnumericalvalues.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandardwiththeexceptionofmilswhendeterminingcoatingthickness.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D823PracticesforProducingFilmsofUniformThicknessofPaint,Varnish,andRelatedProductsonTestPanelsD1005TestMethodforMeasurementofDry-FilmThick-nessofOrganicCoatingsUsingMicrometersD7091PracticeforNondestructiveMeasurementofDryFilmThick...
