Designation:D4449−15(Reapproved2021)StandardTestMethodforVisualEvaluationofGlossDifferencesBetweenSurfacesofSimilarAppearance1ThisstandardisissuedunderthefixeddesignationD4449;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthevisualevaluationofglossdifferencesofcoatingsurfaces,usingspecialtypesoflampsforillumination.Itidentifiessixaspectsortypesofglossthatonemaylookforwhenusingthelamptoassessglossdifferencesbetweensurfaces.Itdescribestheconditionsforusingthelampstobestidentifysmalldifferencesineachofthesixtypesofgloss.Fourlevelsofvisualglossdifferencesaredistin-guished.1.2Whilethistechniqueisusefulforbothweatheredandunweatheredspecimens,ithasnotbeenappliedtometallics.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityofwhoeverusesthisstandardtoconsultandestablishappropriatesafety,health,andenvironmentalprac-ticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3964PracticeforSelectionofCoatingSpecimensforAppearanceMeasurementsE284TerminologyofAppearance3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthismethod,seeTerminologyE284.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1directionalityofsurface,n—perceivedchangeofglossyappearanceofasurfacewith...
