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High Purity Silicon Dioxide at Western Minmetals SiO2 99.999% 1.SiO2�99.999% 2.Impurity Max each Al/Fe/Pb/Ti/Mg 1ppm, Cr/Mn/Co/Sn/Na/Ni/Cu/V 0.5ppm 3.Size as required Packing 25kgs in cardboard drum with plastic bag inside