Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 28 INORGANIC CHEMICALS; ORGANIC OR INORGANIC COMPOUNDS OF PRECIOUS METAL, OFRARE-EARTH METALS, OF RADIOACTIVE ELEMENTS OR OF ISOTOPES 28 33 SULPHATES; ALUMS; PEROXOSULPHATES (PERSULPHATES). 28 33 21 OTHER SULPHATES OF MAGNESIUM Commodity Code Description 28 33 21 00 OTHER SULPHATES OF MAGNESIUM