Designation:C899−79(Reapproved2013)StandardPracticeforUseofMetricUnitsofMeasureforReportingPropertiesofRefractoryMaterials1(COMMITTEEC-8SUPPLEMENTTOE380)ThisstandardisissuedunderthefixeddesignationC899;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticepresentstheunitstobeemployedforreportingthepropertiesofrefractories,suchasdensity,crush-ingstress,modulusofrupture,tensilestress,thermalconductivity,andpermeability.1.2Forconvenience,atableofconversionfactorsbetweeninch-poundunitsandSIunitsisincluded.2.ReferencedDocuments2.1ASTMStandards:2E380PracticeforUseoftheInternationalSystemofUnits(SI)(theModernizedMetricSystem)(Withdrawn1997)32.2ISOStandard:ISO1000SIUnitsandRecommendationsfortheUseofTheirMultiplesandofCertainOtherUnits43.SignificanceandUse3.1Thispracticeisprovidedtofacilitatecomparisonofphysicalandmechanicalpropertiesofrefractorymaterialsbyestablishinguniformpresentationofdata.3.2Unitshavebeenchosen,wherepossible,toresultinnumbersofmagnitudefamiliarintherefractoriesindustry,thatis,g/cm3ratherthantheSIpreferredunitkg/m3.ItisrecommendedthatSIprefixesbeselectedforusewiththeunitssuchthattheresultingnumericalvaluesliebetween0.1and1000.Formostproperties,theprefixeskilo(k)andmega(M)arepreferred.Otherprefixesaregiveninthefollowingtable:MultiplicationFactorPrefixSymbol109106gigamegaGM103102kilohectoAkh10110−1dekaAdeciAdad10−210−3centiAmillicm10−610−9micronanoµnATobeavoidedwherepractical.3.3Theconversionfactors,whichhavebeenselectedfortheirgeneralutilityintherefractoriesindustry,havebeentakenfromStandardE380,wherepossible.Foruniformity,theyhavebeenpresentedtofourdecimalplaces.Inuse,theconvertedvaluesshouldberoundedtothesamenumberofsignificantfiguresasintheoriginalvalue.4.StandardUnits4.1Density—gramspercubiccentimetre(g/cm3).4.2Energyor...
