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 30 SULPHIDES; POLYSULPHIDES, WHETHER OR NOT CHEMICALLY DEFINED. Commodity Code Description 28 30 10 SODIUM SULPHIDES 28 30 90 OTHER SULPHIDES; POLYSULPHIDES, WHETHER OR NOT CHEMICALLY DEFINED