Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 31 Dithionites and sulphoxylates. 28 31 10 28 31 10 00 Commodity Code Description 28 31 10 00 00 - Of sodium 28 31 90 00 00 - Other