Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 52 Inorganic or organic compounds of mercury, whether or not chemically defined, ex 28 52 10 28 52 10 00 Commodity Code Description 28 52 10 00 00 - Chemically defined 28 52 90 00 00 - Other