Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 Inorganic chemicals; organic or inorganic compounds of precious metals , of rare 28 04 Hydrogen, rare gases and other non-metals. Commodity Code Description 28 04 10 28 04 21 28 04 29 28 04 30 28 04 40 28 04 50 28 04 61 28 04 69 28 04 70 28 04 80 28 04 90