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NNiobium Products ASTM B392-98 Pure Nb 99.88% Niobium Wire For Aerospace Grade: Nb1 Nb2 Purity: Nb1 99.88%, Nb2 99.69% Density: ≥16.6g/cm3 Certificate: ISO 9001:2008 Standard: ASTM B362-2003 Size: ...