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High Cold Crushing Strength 72 Al2O3 Mullite Insulating Brick Item DLG180-1.5L DLG170-1.3L LG160-0.8L LG150-0.8L LG140-0.7L LG125-0.5L Al2O3 % ≥90 ≥72 ≥60 ≥55 ≥50 ≥48 Fe2O3 % ≤1.0 ≤1.0 ≤1.0 ≤1.0 ≤1.0 ...