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Item LL-1 LL-2 LL-3 LL-4 Al2O3(%min) 70 75 77 80 Fe2O3(%max) - - - 1.5 ??(g/cm3) 2.68 2.7 2.75 2.85 Refractoriness 1765 1770 1770 1790 C.C.S mpa 58.5 60 80 70 R.U.L 1320 1350 1400 1470