Section 06 Products of the chemical or allied industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare - earth metals, of radioactive elements or isotopes 28 05 Alkali or alkaline-earth metals; rare-earth metals... ; mercury 28 05 12 Calcium 28 05 12 00 Calcium Commodity Code Description 28 05 12 00 000 Calcium
