Designation:C584−81(Reapproved2016)StandardTestMethodforSpecularGlossofGlazedCeramicWhitewaresandRelatedProducts1ThisstandardisissuedunderthefixeddesignationC584;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationof60°specu-larglossofglazedceramicwhitewaresandrelatedproducts.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D523TestMethodforSpecularGloss3.Terminology3.1Definitions:3.1.1speculargloss—theratioofreflectedtoincidentlight,times1000,forspecifiedaperturesofilluminationandrecep-tionwhentheaxisofreceptioncoincideswiththemirrorimageoftheaxisofillumination.34.SignificanceandUse4.1Thistestmethodprovidesameansofestablishingspecularglosslimitsforbright,semi-mat,andmatglazedsurfaces.Itisrealizedthatspecularglossmeasurementsdonotalwayscorrelatewellwithvisualrankingsofglossinessbe-causespecularglossisonlyoneofseveralrelatedappearanceattributesthatproducethesensationofgloss.However,theprescribedtestmethodisofsufficientaccuracyfortheintendedpurpose.NOTE1—Ifagreaterdegreeofdistinctionbetweenbrightglazedsurfacesisdesired,the20°geometryinstrumentwillprovideit.45.Apparatus5.1InstrumentalComponents—Theapparatusshallconsistofanincandescentlightsourceandlensfurnishinganincidentbeamofraysofrequiredaperture,meansforlocatingthesurfaceofthespecimen,andareceptorlocatedtoreceivetherequiredpyramidofraysreflectedfromthespecimen.Thereceptorshallbeaphotosensitivedevicehavingmaximumresponsenearthemiddleofthevisibleregionofthespecimen.5.2GeometricConditions—Theaxisoftheincidentbeamshallbe60°fromtheperp...
