Designation:D7786−13(Reapproved2019)StandardTestMethodforDeterminingEnamelHoldout1ThisstandardisissuedunderthefixeddesignationD7786;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisstandardprovidesamethodfordeterminingtheholdoutcharacteristicsofaprimerandtopcoatcoatingappli-cation.Astandardtopcoatisusedtodeterminetheabsorptioncharacteristicsofaprimer.Enamelholdoutcanbemeasuredasadifferenceinobservedglossofthetopcoatoveraprimer,relativetotheglossofthesametopcoatoveranon-porous,smoothsurface.1.2Thestandardiswritteninthecontextthattheuserwillbeevaluatingtheenamelholdoutcharacteristicsofaprimer.Alternatively,thestandardmaybeusedasamethodtoevaluatetheenamelholdoutcharacteristicsofprimer/topcoatsystemwheretheprimerisconstantanddifferenttopcoatsareusedastestpaints.1.3Thisstandardmayalsobeusedforevaluationofpaintsotherthanprimersasthefirstcoat.Inthisalterationtheusercantesttheenamelholdoutcharacteristicsofaself-primedtopcoat,oruseofanyothertypeofpaintastheprimerfollowedbytheuseofastandardtopcoat.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D523TestMethodforSpecularGlossD823PracticesforProducingFilmsofUniformThicknessofPaint,...
