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 52 Inorganic or organic compounds of mercury, whether or not chemically d efined, excluding amalgams. 28 52 90 Mercury tannates Commodity Code Description 28 52 90 10 Mercury tannates 28 52 90 20 Mercury sulphides; mercury polysulphides; mercury polyphosphates; mercury carbides; h 28 52 90 90 Other