| Tariff Classification |
| section 06 | Products of the chemical or allied industries |
| chapter 28 | Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes |
| 28.36 | Carbonates; peroxocarbonates (percarbonates); commercial ammonium carbonate containing ammonium carbamate: |
| 2836.50 | －Calcium carbonate |
|