Designation:D5064−16a(Reapproved2021)StandardPracticeforConductingaPatchTesttoAssessCoatingCompatibility1ThisstandardisissuedunderthefixeddesignationD5064;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheproceduresforassessingcoat-ingcompatibilitywhenmaintenanceofanin-placecoatingsystemisbeingcontemplated.Itdoesnotaddressproceduresforassessingtheintegrityoftheexistingcoatingtodetermineifitcanberepainted,nordoesitestablishthecompatibilityofthemaintenancecoatingsystemwiththesubstrateorcorrosionproducts.Thepracticeisintendedforuseinthefield.SSPC-TU3discussestherisksassociatedwiththemainte-nancepaintingpracticeknownasovercoating.NOTE1—Pass-FailCriteria(forexample,adhesionrequirements)arenotestablishedbythispractice.Theseshouldbeestablishedbytheuserorspecifierwithinputfromthecoatingmanufacturer.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D16TerminologyforPaint,RelatedCoatings,Materials,andApplicationsD3359TestMethodsforRatingAdhesionbyTapeTestD4138PracticesforMeasurementofDryFilmThicknessofProtectiveCoatingSystemsbyDestructive,Cross-SectioningMeansD4414PracticeforMeasurementofWetFilmThicknessbyNotchGag...
