Designation:C448−88(Reapproved2016)StandardTestMethodsforAbrasionResistanceofPorcelainEnamels1ThisstandardisissuedunderthefixeddesignationC448;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThistestisameansofquantifyingtheabrasionresistanceofporcelainenamelsthroughsteady-statesubsurfaceabrasivewearwithstainlesssteelballbearings.Achangeinglossorweightlossisreportedthatcan,throughfurtherevaluation,becorrelatedtotheservicelifeoftheenameledware.1.Scope1.1Thesetestmethodscoverdeterminationoftheresistanceofporcelainenamelstosurfaceabrasionandsubsurfaceabrasion.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C346TestMethodfor45-degSpecularGlossofCeramicMaterials3.SummaryofTestMethods3.1Thefirstofthetestsdescribedhereinisintendedforthedeterminationoftheresistancetosurfaceabrasionofporcelainenamelsforwhichtheunabraded45°specularglossismorethan30glossunits.Itconsistsessentiallyofmeasuringthespecularglossofthespecimensbeforeandafteraspecifiedabrasivetreatmentofthesurface,andtakingthepercentageoftheoriginalspecularglossthatisretainedaftertreatmentasthesurfaceabrasionindex.3.2Thesecondtestisintendedforthedeterminationoftheresistancetosurfaceabrasionofporcelainenamelsforwhichtheunabraded45°specularglossis30glossunitsorless.Itconsistsofdeterminingtheweightlossbyaspecifiedabrasivetreatmentandmultiplyingthisweightlossbyanadjustmentfactorassociatedwitheachabrasivetester,lotofabrasive,andlotofcalibratedplateglassstandardsused.Theadjustedweightlossistakenasanindexofresistancetosurfaceabrasion.3.3Thethirdtestisintendedforthedeterminat...
