Praseodymium is a chemical element with symbol Pr and atomic number 59. Praseodymium is a soft, silvery, malleable and ductile metal in the lanthanide group. It is valued for its magnetic, electrical, chemical, and optical properties.
P 5707 (OTTO) Praseodymium powder, 5-10 μm, 99.9% Cas 7440-10-0 - used in aircraft engines; yttrium and neodymium are also viable substitutes.