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 36 Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate Commodity Code Description 28 36 20 - Disodium carbonate 28 36 30 - Sodium hydrogencarbonate (sodium bicarbonate) 28 36 40 - Potassium carbonates 28 36 50 - Calcium carbonate 28 36 60 - Barium carbonate 28 36 91 - - Lithium carbonates 28 36 92 - - Strontium carbonate 28 36 99 - - Other