1.SXSHQB-12 Al2O3>45 Fe2O3<1.3 Refractoriness>1750 Refractoriness under load>1560 Linear change after heating 1500, 2h: 0, -0.1 Apparent porosity (%)<12 Cold crushing strength(Mpa)>70 Bulk density (g/cm3) >2.35 2.SXSHQB-13 Al2O3>45 Fe2O3<1.5 Refractoriness>1750 Refractoriness under load>1550 Linear change after heating 1500, 2h: 0, -0.1 Apparent porosity (%)<13 Cold crushing strength(Mpa)>65 Bulk density (g/cm3) >2.35 3.SXSHQB-15 Al2O3>45 Fe2O3<1.6 Refractoriness>1750 Refractoriness under load>1540 Linear change after heating 1500, 2h: 0, -0.1 Apparent porosity (%)<15 Cold crushing strength(Mpa)>60 Bulk density (g/cm3) >2.30