Section 06 Products of the chemical or allied industries 28 Inorganic chemicals; organic or inorganic compounds of precious metals, of rare - earth metals, of radioactive elements or isotopes 28 36 Carbonates; peroxocarbonates; commercial ammonium carbonate Commodity Code Description 28 36 20 Disodium carbonate 28 36 30 Sodium hydrogen- carbonate (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
