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Cr2O3 :54% Basis 52% Min. SiO2 : 3% Max. 2.5% Typ. CaO : 1% Max. FeO : 16% Max. MgO : 18% Max. Al2O3 : 13% Max. Cr:Fe Ratio â?¦ 3.25:1% Min. Size and Packing: As per Buyers requirement.