Designation:C545−97(Reapproved2013)StandardClassificationofZirconRefractories1ThisstandardisissuedunderthefixeddesignationC545;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisclassificationcoversfiredrefractorybrickandshapesconsistingpredominantlyofzircon(ZrO2·SiO2)andcontaining,bychemicalanalysis,notlessthan60%zirconiumoxide(ZrO2)andnotlessthan30%silica(SiO2).1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:2C20TestMethodsforApparentPorosity,WaterAbsorption,ApparentSpecificGravity,andBulkDensityofBurnedRefractoryBrickandShapesbyBoilingWaterNOTE1—Chemicalanalysisofrefractoryproductsaredeterminedbyacombinationofx-rayfluorescence(XRF)andinductivelycoupledplazma(ICP)usingstandardreferencematerials(SRM),includingvarioustypesofmineralsandrefractorymaterialswhichareavailablefromtheNationalInstituteofStandardsandTechnologyandotherappropriatesources.C830TestMethodsforApparentPorosity,LiquidAbsorption,ApparentSpecificGravity,andBulkDensityofRefractoryShapesbyVacuumPressure3.SignificanceandUse3.1Thezirconcontentandbulkdensityofazirconia-silicarefractorymaterialhaveimportantinfluencesonchemicalresistanceanditssatisfactoryuseinrefractoryapplications.Thisclassificationisconsideredusefulforpurchasespecifica-tionsandqualitycontrol.4.BasisofClassification4.1Types:4.1.1TypeA(Regular)—Zirconrefractorieshavingabulkdensityoflessthan240lb/ft3(3.84g/cm3).4.1.2TypeB(Dense)—Zirconrefractorieshavingabulkdensityof240lb/ft3(3.84g/cm3)ormore.5.TestMethods5.1ThepropertieslistedinthisclassificationshallbedeterminedbythefollowingASTMmethods:5.1.1BulkDensity—TestMethodsC20orC830.5.1.2ChemicalAnalysis...
