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Harmonized System
Potassium PFOS is the most commercially recognized salt form of perfluorooctane sulfonic acid, widely associated with legacy uses in fabric protection, metal plating, and aqueous film-forming foam (AFFF). China is the dominant supplier of this substance to the US market, and imports from China are subject to Section 301 tariffs. EPA's TSCA authority and ongoing PFAS regulatory actions create a complex admissibility environment that importers must navigate carefully.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Yes. Imports of potassium perfluorooctane sulfonate originating from China are subject to Section 301 tariffs in addition to the standard column 1 duty rate. Importers should confirm the applicable tariff list and any exclusion orders with a licensed customs broker prior to shipment.
The Harmonized System assigns potassium PFOS its own dedicated HS6 heading (290434), separate from lithium PFOS (290433) and other PFOS salts (290435). The distinction matters because duty rates, trade-remedy exposure, and any applicable TSCA reporting obligations may differ by specific salt form.
Subheading 8 of 10 in heading 2904
Subheading 290434 · $0 of $10.1M
Supplier Network
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HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2904340000 | Potassium Perfluorooctane Sulfonate | $4K |
Imports · December 2025
origin
customs district
destination
None recorded for this period.
entry
None recorded for this period.
rate provision · imports
None recorded for this period.
ImportsExports
Imports
$0YoY · Pro
Exports
$4KYoY · Pro
12-mo low · imports
YoY · ProFewer than 6 of the last 12 months reported trade above $500K; the trend chart is not shown for thin series.
Through December 2025. Source: U.S. Census Bureau.