Channel bricks ZrO2(%) 20 Al2O3(%) 58 Fe2O3(%) 0.5 Apparent Porosity(%) 14.5 Bulk Density(g/cm3) 2.93 Cold Crushing Strength(MPa) 140 Refractoriness under load(T2) 1685 The products have high alkali corrosion resistance and thermal shock resistance. Therefore this kind of brick is suitable for superstructure, Channel, Paving, and sub paving.