Section 06 Products of the chemical or allied 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare earth metals, of radioactive elements or isotopes 28 33 Sulphates; alums; peroxosulphates (persulphates) 28 33 40 - Peroxosulphates (persulphates) Commodity Code Description 28 33 40 00 - Peroxosulphates (persulphates)