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Al2O3 86%-91%SiO2 4.0-6.5%TiO2 2.5-4.5%Fe2O3 2.5% maxK2O 1.2% maxC 0.05% maxS 0.020% maxP 0.040% maxMoisture 0.3% maxSize distribution: 0-0.2 mm 85% min., including+0.4 mm -0% +0.315 mm 2% max+0.2 mm 15% max+0.16 mm 15% max+0.1 mm 5-20%+0.063 mm 15-40%+0.045 mm 5-20%-0.045 mm 45% max calcined, welding sort, bauxite bauxite, wollastonite, magnesite, rice hulls ash