Designation:C27−98(Reapproved2018)StandardClassificationofFireclayandHigh-AluminaRefractoryBrick1ThisstandardisissuedunderthefixeddesignationC27;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisclassificationcoversmachine-madefireclayandhigh-aluminarefractorybrick,anditspurposeistosetforththevariousclassesandtypesofthesematerialsinaccordancewiththeirnormalandcharacteristicproperties,whichareimportantintheiruse.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C16TestMethodforLoadTestingRefractoryShapesatHighTemperaturesC24TestMethodforPyrometricConeEquivalent(PCE)ofFireclayandHigh-AluminaRefractoryMaterialsC113TestMethodforReheatChangeofRefractoryBrickC133TestMethodsforColdCrushingStrengthandModu-lusofRuptureofRefractoriesC134TestMethodsforSize,DimensionalMeasurements,andBulkDensityofRefractoryBrickandInsulatingFirebrickNOTE1—ChemicalanalysisofrefractoryproductsisdeterminedbyacombinationofX-rayfluorescence(XRF)andinductivelycoupledplasma(ICP)usingstandardreferencematerials(SRM),includingvarioustypesofmineralsandrefractorymaterialsthatareavailablefromtheNationalInstituteofStandardsandTechnology3andotherappropriatesources.3.SignificanceandUse3.1Alumina-silicarefractorybrickisproducedfromvari-ouscombinationsofaluminaandsilica-...
