Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED 28 Inorganic chemicals;organic or inorganic compounds of precious metals, ofrare-earth, of radioactive elements or of isotopes 28 50 HYDRIDES, NITRIDES, AZIDES, SILICIDES AND BORIDES Commodity Code Description 28 50 00 Hydrides, nitrides, azides, silicides and borides, whether or not chemically def