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 49 CARBIDES, WHETHER OR NOT CHEMICALLY DEFINED. Commodity Code Description 28 49 10 CARBIDES OF CALCIUM 28 49 20 CARBIDES OF SILICON 28 49 90 OTHER CARBIDES