1.white or yellowish power 2.for production of metallurgical and chemical industrial and so on GradeNb2O5Main ... .005Ta0.05Ti0.002W0.003Ignition Loss, %, max0.2Niobium oxide is used for the metallurgical industry, atomic energy industry, aviation and space industry ... , chemical industry, superconducting materials and medical instrument. Nb-5 type for oil industrial