Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METAL, OFRARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES 28 05 ALKALI, OR ALKILINE-EARTH METALS; RARE-EARTH METALS, SCANDIUM AND YTTRIUM, Commodity Code Description 28 05 11 SODIUM 28 05 12 CALCIUM 28 05 19 OTHER ALKALI OR ALKALINE - EARTH METALS 28 05 30 REAR-EARTH METALS, SCANDIUM AND YTTRIUM, WHETHER OR NOT INTERMIXED 28 05 40 MERCURY