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Item AL-1 AL-2 AL-3 AL-4 Al2O3(%min) 75 65 55 48 Fe2O3(%max) 0.7 1.0 1.0 1.8 R.U.L 0.2mpa 1520 1500 1470 1420 Refractoriness 1790 1790 1770 1750 A?P 22 22 21 21 C?C?S Mpa 53.9 49 44.1 39.2
