CAS 7440-03-1 appears in our catalog under these names: Niobium foil, 0.127mm (0.005in) thick, 99.97% (metals basis , Niobium foil, 0.25mm (0.01in) thick, 99.97% (metals basis ex, Niobium pieces, 99.8% (metals basis) , Niobium foil, 1.0mm (0.04in) thick, annealed, 99.8% (metals , Niobium foil, 0.25mm (0.01in) thick, annealed, 99.8% (metals. Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 25x25mm, 50x50mm, 25x100mm, 50x100mm, 100g, 500g, 100x200mm, 200x500mm.