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) Commodity Code Description 28 33 11 - - Disodium sulphate 28 33 19 - - Other 28 33 21 - - Of magnesium 28 33 22 - - Of aluminium 28 33 24 - - Of nickel 28 33 25 - - Of copper 28 33 27 - - Of barium 28 33 29 - - Other 28 33 30 - Alums 28 33 40 - Peroxosulphates (persulphates)