Analysis
HTS 2813.90.10 covers other: of arsenic under heading 2813 (sulfides of nonmetals; commercial phosphorus trisulfide).
Within this group the rate runs from duty-free to 3.7%. Compared with 2813.90.50 (other: other), which pays 3.7%, a misclassification either way moves the duty by 3.7 percentage points.
The normal trade relations rate here is zero, shared by about 29% of the 274 tariff lines in chapter 28, a useful check when a neighbouring dutiable line is a candidate. Chapter 99 measures such as Section 301 or 232 can still apply on top, depending on where the goods come from.
The other lines in the same group are 2813.90.20 (other: of phosphorus, duty-free) and 2813.90.50 (other: other, 3.7%).
Census statistics map these goods to NAICS 325180 (Other Basic Inorganic Chemical Manufacturing), an industry of 705 US establishments employing 41,447 people. That concordance is how imports of this line are compared with US output.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2813.90.20 | Other: of phosphorus | Free |
| 2813.90.50 | Other: other | 3.7% |