Designation:C724−91(Reapproved2015)StandardTestMethodforAcidResistanceofCeramicDecorationsonArchitectural-TypeGlass1ThisstandardisissuedunderthefixeddesignationC724;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversqualitativedeterminationoftheacidresistanceoftheceramicdecorationonarchitecturalglass.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1architecturalglass—glassusedinthebuildingindus-try.3.SummaryofTestMethod3.1Thistestmethodqualitativelydetermines,byvisualinspection,thedegreeofattackuponaceramicdecorationbya10%citricacidsolutionandanominal3.7%hydrochloricacidsolution.4.SignificanceandUse4.1Thistestmethodevaluatesthequalityandserviceabilityofaceramicdecorationonarchitecturaltypeglass.Thedegreeofattackisdeterminedusinganacidicsolutionbothquantita-tivelyandqualitatively.4.2Thistestmethodprovidesaconvenientcontroltestduringthemanufactureoftheware.4.3Thistestmethodissuitableforspecificationacceptance.5.Reagent5.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety,wheresuchspecificationsareavailable.2Othergradesmaybeused,provideditisfirstascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.5.2CitricAcidSolution(1+9)—Add10partsbymassofreagentgradecitricacidto90partsbymassofdistilledwater.Pr...
