Analysis
Heading 2820 of the Harmonized Tariff Schedule covers manganese oxides. It divides into 2 six-digit subheadings and 2 eight-digit tariff lines, with 2 ten-digit statistical suffixes below them.
None of its 2 lines is duty-free at the general rate. Rates run from 4.7% to 4.7% with a median of 4.7%, so the line you choose sets the duty.
Its median rate of 4.7% sits at the 85th percentile of the headings in chapter 28.
The largest subheadings are 2820.10 (unnamed, 1 line) and 2820.90 (unnamed, 1 line).
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.
The heading text decides whether a product belongs here at all (General Rule of Interpretation 1); the subheadings and lines below it only apply once that is settled. Section and chapter notes can override the heading wording, so read them for borderline goods.
Tariff lines
| Line | Description | General rate |
|---|---|---|
| 2820.10.00 | Manganese oxides: manganese dioxide | 4.7% |
| 2820.90.00 | Manganese oxides: other | 4.7% |