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High thermal shock brick physicochemical index chemical composition（%），SiO2 ≥99 alkali metal （%）， Na2O3 + K2O ＜0.2 bulk density ~1.85 g/cm3 Compressive strength at ambient temperature ≥40MPa Thermal expansion rate 1000℃ ＜0.2% The thermal shock is stable, 1000 degrees centigrade, and water cooled ≥30 