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 44 MIXTURES AND RESIDUES CONTAINING THESE PRODUCTS. Commodity Code Description 28 44 10 NATURAL URANIUM AND ITS COMPOUNDS; ALLOYS, 28 44 20 URANIUM ENRICHED IN U 235 AND ITS COMPOUNDS; PLUTONIUM & ITS COMPOUNDS; 28 44 30 URANIUM DEPLETED IN U 235 & ITS COMPOUNDS; THORIUM & ITS COMPOUNDS; 28 44 40 RADIOACTIVE ELEMENTS & ISOTOPES & COMPOUNDS 28 44 50 SPENT (IRRADIATED) FUEL ELEMENTS (CARTRIDGES) OF NUCLEAR REACTORS