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Glazed tile of furnace door Item Al2O3 ≥ 50 MgO ≥ 3.0 Bulk Density, g/cm3 ≥ 2.10--2.40 Apparent Porosity,% ≤ 28 Compressive Strength, MPa ≥ 45 Thermal Shock Resistance,1100℃ water-cooled,Times ≥ 50 ...