Designation:D3964−10(Reapproved2020)StandardPracticeforSelectionofCoatingSpecimensforAppearanceMeasurements1ThisstandardisissuedunderthefixeddesignationD3964;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesaguidetoselectionofspecimensforappearancemeasurementbyreflectedlightaswellasadiscussionoffactorstobeconsideredintheirpreparationformeasurement.Standardizedselectionandpresentationproce-dureswillassistinachievingagreementbetweenevaluationscarriedoutindifferentlaboratoriesaswellashelpingtoachievebettercorrelationsbetweenvisualevaluationsandinstrumentalmeasurements.NOTE1—Thisstandardisnotapracticeforpreparationoftestpanelsofcoatings;seePracticesD823.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D823PracticesforProducingFilmsofUniformThicknessofPaint,CoatingsandRelatedProductsonTestPanelsE284TerminologyofAppearance3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthispractice,refertoTerminologyE284.4.SignificanceandUse4.1Manyofthespecimensthatareregularlysubmittedtomeasurementdepartinsomedegreefromtheidealrequire-ments.Forthisreasoninstrumentalreadingsareaffectedimportantlybythemannerinwhichspecimensareselectedandpresentedformeasurement.Reproduciblemeasurementsarefacilitatedbystandardizationand...
