Analysis
Subheading 2811.22 covers silicon dioxide, within heading 2811. The first six digits are shared by every country that uses the Harmonized System, so this part of the code is the same in the US, UK and EU schedules; the 2 US tariff lines below it are national.
1 of its 2 lines with a percentage rate are duty-free at the general rate (50%) and 1 are dutiable, from duty-free up to 3.7%. The median line pays 1.85%.
The US splits it as follows: 2811.22.10 for synthetic silica gel (3.7%) and 2811.22.50 for silicon dioxide: other (duty-free).
By Census's concordance, most of its statistical lines are made by Other Basic Inorganic Chemical Manufacturing (325180). Those are the NAICS industries a US producer of these goods would report under.
Goods only reach 2811.22 once they fall within heading 2811 (other inorganic acids and other inorganic oxygen compounds of nonmetals). Under General Rule 6, subheadings are then compared only with others at the same level, so a product is matched against its siblings, not against lines elsewhere in the chapter.
Tariff lines
| Line | Description | General rate |
|---|---|---|
| 2811.22.10 | Synthetic silica gel | 3.7% |
| 2811.22.50 | Silicon dioxide: other | Free |