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High Alumina Andalustie Based Brick Data Item Chemical Composition Al2O3% ≥ 58 57 56 55 SiO2% ≤ 38 40 40 41 Fe2O3% ≤ 0.8 0.8 1 1.2 K2O % ≤ 0.077 0.12 0.16 0.16 NaO % ≤ 0.44 0.52 0.56 0.56 Reheating ...