Section 06 Products of the chemical or allied 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, scandium and yttrium, whether or not intermixed or interalloyed; mercury Commodity Code Description 28 05 11 - - Sodium 28 05 12 - - Calcium 28 05 19 - - Other 28 05 30 - Rare-earth metals, scandium and yttrium, whether or not intermixed or inter-alloyed 28 05 40 - Mercury