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Cr2O3: 42% Basis 40% Min. SiO2: 12% Max. MgO: 22% Max. Al2O3: 15% Max. P: 0.07% Max. S: 0.05% Max. Cr:Fe Ratio = 2.6:1% Min. Size : 10-300 mm 70% Min. 0-10 mm 30% Max.