... on GradeNb2O5Main content, % By substraction(exclusive of F, Ignition Loss)99.5Impurity content(ppm max.)Al0.002Cr0.003Cu0.005F0.1Fe0.02Mn0 ... .005Mo0.003Ni0.02Si0.005Ta0.05Ti0.002W0.003Ignition Loss, %, max0.2Niobium oxide is used for the metallurgical industry, atomic energy industry, aviation ... , chemical industry, superconducting materials and medical instrument. min99.5% niobium oxide for alloys