... you have any requirement, please contact us freely. METALLURGICAL GRADE NIOBIUM POWDER SPECIFICATIONS: GradeNb (min %)Impurity Contained (ppm max)Particle ... alloy, praseodymium, neodymium and dysprosium alloys, metal lanthanum, low iron, low magnesium mixed rare earth alloy, magnetic materials, phosphors, flint ... cooperation with you to grow and develop together. niobium powder(nb) with purity 99.9%