Section 06 Products of the chemical or allied industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare - earth metals, of radioactive elements or isotopes 28 50 Hydrides, nitrides, azides, silicides and borides 28 50 00 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, 28 50 00 00 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, Commodity Code Description 28 50 00 00 000 Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined,
