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 28 36 40 - Potassium carbonates Commodity Code Description 28 36 40 00 - Potassium carbonates