Hydrogen, rare gases and other nonmetals:
| Subheading | Description | General | Special | Other |
|---|---|---|---|---|
| 2804.10 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.21 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.29 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.30 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.40 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.50 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.61 | Hydrogen, rare gases and other nonmetals | — | — | — |
| Silicon: | ||||
| 2804.69 | Other: | — | — | — |
| 2804.70 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.80 | Hydrogen, rare gases and other nonmetals | — | — | — |
| 2804.90 | Hydrogen, rare gases and other nonmetals | — | — | — |