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 28 36 50 Calcium carbonate 28 36 50 00 Calcium carbonate Commodity Code Description 28 36 50 00 000 Calcium carbonate
