Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED 28 Inorganic chemicals;organic or inorganic compounds of precious metals, ofrare-earth, of radioactive elements or of isotopes 28 11 OTHER INORGANIC ACIDS AND OTHER INORGANIC OXYGEN COMPOUNDS OF NON-METALS Commodity Code Description 28 11 11 Hydrogen fluoride (hydrofluoric acid) 28 11 19 Other 28 11 21 Carbon dioxide 28 11 22 Silicon dioxide 28 11 29 Other: