Designation:C861−93(Reapproved2014)StandardPracticeforDeterminingMetricDimensionsofStandardSeriesRefractoryBrickandShapes1ThisstandardisissuedunderthefixeddesignationC861;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversdimensionsinmillimetresforstandardseriesrefractorybrickandshapesofallcompositions.1.2Astandardmethodforconvertingallotherdimensionsofshapedrefractoryarticlesfrominch-poundtoSIunitsisincluded.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.2.ReferencedDocuments2.1ASTMStandards:2IEEE/ASTMSI10AmericanNationalStandardforUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem3.SignificanceandUse3.1Thispracticeisprovidedintheinterestoffacilitatingthetransitionofdimensionalpracticeforstandardrefractorybrickandshapesfrominch-poundunitstometric(SI)units.3.2Thestandarddimensionsarebasedona38-mmmodule(takenastheequivalentto1.5in.)andaredevelopedwiththeaimofpreservingamodularrelationshipbetweenthedimen-sionsoftheprincipalrectangularrefractoryshapes.4.StandardDimensions4.1Table1liststhestandardnominaldimensionsinmillimetres,withcorrespondingstandarddimensionsininch-poundunitsshownforreferenceonly.Notethatthesedimen-sionsarenotexactconversions,butinallbuttwocasesarewithin1⁄4%oftheexactvalue.5.Conversion5.1FordimensionsnotlistedinTable1,multiplythedimensionininchesbythefactor25.4toobtaintheexactconversioninmillimetres.Fordescriptionorspecificationofrefractoryshapes,roundthedimensiontothenearestwholemillimetre.Forexample:1in.×25.4=25.4mm,expressedas25mm11in.×25.4=279.4mm,expressedas279mm221⁄2in.×25.4=571.5mm,expressedas572mm6.StandardEquivalent6.1Forclosestapproximationtoinch-poundunits,themetric(SI)StandardEquivalentisbaseduponthe228by114by64-mmstraight.OneStandardEq...
