Designation:C467−14StandardClassificationofMulliteRefractories1ThisstandardisissuedunderthefixeddesignationC467;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisclassificationcoversrefractoryproductsconsistingpredominantlyofmullite(3Al2O3·2SiO2)crystalsthatareformedbyeitherconvertinganyofthesillimanitegroupofminerals,orsynthesizingfromappropriatematerialsinameltorsinterprocess.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:2C16TestMethodforLoadTestingRefractoryShapesatHighTemperaturesNOTE1—Chemicalanalysisofrefractoryproductsaredeterminedbyacombinationofx-rayfluorscence(XRF)andinductivelycoupledplazma(ICP)usingstandardreferencematerials(SRM),includingvarioustypesofmineralsandrefractorymaterialswhichareavailablefromtheNationalInstituteofStandardsandTechnologyandotherappropriatesources.C832TestMethodofMeasuringThermalExpansionandCreepofRefractoriesUnderLoad3.SignificanceandUse3.1Themullitecontentofanalumina-silicarefractorymaterialhasanimportantinfluenceonvolumestability,loadbearingproperties,anditssatisfactoryuseinrefractoryappli-cations.Thisclassificationisconsideredusefulforpurchasespecificationsandqualitycontrol.4.BasisofClassification4.1Therefractoryproductsfallingwithinthescopeofthisclassificationareclassifiedbychemicalandphysicalteststomeetthefollowingrequirements:Aluminacontent,%Impurities,Amax,%Deformation,Bmax,%56to7955AImpuritiesrefertometaloxidesotherthanthoseofaluminumandsilicon.BWhentestedinaccordancewith6.1.2.5.TestSpecimens5.1Testingforcompliancewiththisclassificationshallbeperformedon9by41⁄2by21⁄2-in.(228by114by64-mm)rectangularbrickasmade,oronspecimenso...
