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Item Percentage % SiO 99.3 - 99.85 FeO 0.012 - 0.014 CrO 0.0003 Max TiO Traces Al 0.10 - 0.20 CaO 0.02 - 0.05 MgO 0.002 - 0.005 L.O.I 0.1 - 0.2