... requirement, please contact us freely. METALLURGICAL GRADE NIOBIUM POWDER SPECIFICATIONS: GradeNb (min %)Impurity Contained (ppm max ... sizeCHONAlCrCuFeMnMoNiSiTaTiWNb-199.9%50050300060050505050050505010010003050-150mesh DESCRIPTION: In powder with deep-gray color.USAGE:Used in niobium ... alloys, metal lanthanum, low iron, low magnesium mixed rare earth alloy, magnetic materials, phosphors, flint and ...