Bismuth is a chemical element with symbol Bi and atomic number 83. Bismuth, a pentavalent post-transition metal, chemically resembles arsenic and antimony. Elemental bismuth may occur naturally
B 6489 (OTTO) Bismuth foil, 0.03 mm thick, ≥99.97% 99.5% - used to make free-machining steels and free-machining aluminium alloys for precision machining properties.