Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 50 Hydrides, nitrides, azides, silicides and borides, whether or not chemically def 28 50 00 28 50 00 00 Commodity Code Description 28 50 00 00 00 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, ot