Chemical indexes Chemical compositionTest valueStandardUnitTest standard Al2o339.738%Gb Fe2o31.781613.0% Physical indexes Physical propertiesTest valueStandardUnitTest standard Bulk density2.122.10G/cm3Gb/t2999-2002 Apparent porosity23.1716125%Gb/t2997-2000 Cold crushing strength38.3230MpaGb/t5072-2008 Refractoriness1710cGb/t7322-2007 Size2301613MmGb 1141612Mm 65(75)1611.5Mm Size is: 230 161 114 161 65 (75) mm.