Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 05 Alkali or alkaline-earth metals; rare-earth metals, scandium and yttrium, whethe 28 05 11 28 05 11 00 Commodity Code Description 28 05 11 00 00 -- Sodium 28 05 12 00 00 -- Calcium 28 05 19 00 00 -- Other 28 05 30 00 00 - Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed 28 05 40 00 00 - Mercury