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 50 OF HEADING 28.49. Commodity Code Description 28 50 00 HYDRIDES, NITRIDES, AZIDES, SILICIDES & BORIDES....OTHER THAN OF HD. 28.49