Lanthanum is a soft, ductile, silvery-white metallic chemical element with symbol La and atomic number 57.
L 1209 (OTTO) Lanthanum powder, -200 mesh, 99.9% Cas 7439-91-0 - used in Physical Vapor Deposition (PVD) processes, including thermal and electron-beam (e-beam) evaporation, for the preparation of thin films.