| 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 |
| 28.11 | Other inorganic acids and other inorganic oxygen compounds of non-metals: |
| －Other inorganic oxygen compounds of non-metals: |
| 2811.22 | －－Silicon dioxide |
|