Tantalum pentoxide, also known as tantalum(V) oxide, is the inorganic compound with the formula Ta2O5. It is a white solid that is insoluble in all solvents but is attacked by strong bases and hydrofluoric acid.
T 1222 (OTTO) Tantalum oxide, 99% Cas 1314-61-0 - used to make special optical glass, for lasers, and in electronic circuits.