Sub Headings of 2804
| 2804.10.00.00 | Hydrogen |
| 2804.21.00.00 | Argon |
| 2804.29.00. | Other |
| 2804.30.00.00 | Nitrogen |
| 2804.40.00.00 | Oxygen |
| 2804.50.00. | Boron; tellurium |
| 2804.61.00.00 | Containing by weightnot less than 99.99 percent of silicon |
| 2804.69.10.00 | Containing by weight less than 99.99 percent but not less than 99 percent ofsilicon |
| 2804.69.50.00 | Other |
| 2804.70.00.00 | Phosphorus |
| 2804.80.00.00 | Arsenic |
| 2804.90.00.00 | Selenium |