CAS 7440-52-0 appears in our catalog under these names: Erbium pieces, 99.9% (REO) , Erbium foil, 0.62mm (0.024in) thick, 99.9% (REO) , Erbium foil, 0.1mm (0.004in) thick, 99.9% (REO) , Erbium rod, 6.35mm (0.25in) dia, 99.9% (metals basis excludi, Erbium rod, 12.7mm (0.5in) dia, 99.9% (metals basis excludin. Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 10g, 50g, 25x25mm, 50x50mm, 25mm, 50mm, 10mm, 5g.