Hafnium is a chemical element with symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in zirconium minerals.
(Stored under water)
H 3344 (OTTO) Hafnium foil, 0.05 mm thick, 99.9% - used in electronic and semiconductor application.