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 (percarbonates); commercial ammonium carbonate containing ammonium carbamate. 28 36 91 Lithium carbonates Commodity Code Description 28 36 91 00 Lithium carbonates