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Item Corundum Mullite Bricks Al2O3 (%) ≥78 SiO2 (%) ≤20 Fe2O3 (%) <0.5 Bulk Density, (g/cm3) ≥2.7 Apparent Porosity,(%) ≤20 Cold Crushing Strength (Mpa) ≥70 Refractoriess under load (0.2MPa,0.6%)℃ ...