Density 8.57 Quality according to ASTM: B 392 (Rod) B 393 (Sheet, Strip, Plate, Foil) B 394 (Tube)
Due to its excellent corrosion resistance, niobium is also used in chemical construction. In many cases niobium can replace the more expensive and heavier tantalum. Niobium can also be used to produce superconductors and superconducting magnets.
Sodium vapour lamps contain niobium alloyed with 1% zirconium