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Niobium Powder for Metallurgical Usage Grade FNb-A FNb-B FNb-C NbXF-A NbXF-B Purity 99.9 99.5 99 99.9 99.5 Impurities Content % MAX Ta 0.05 0.2 0.5 0.05 0.2 O 0.2 0.3 - 0.3 0.4 H 0.005 0.005 0.08 0...