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 11 Other inorganic acids and other inorganic oxygen compounds of non-metals Commodity Code Description 28 11 11 Hydrogen fluoride (hydrofluoric acid) 28 11 12 Hydrogen Cyanide (hydrocyanic acid) 28 11 19 Other 28 11 21 Carbon dioxide 28 11 22 Silicon dioxide 28 11 29 Other
