Beyond the lithium and potassium forms, the remaining PFOS salts — ammonium, diethanolammonium, and others — are consolidated under a single US tariff line (2904350000). China and Norway are the leading sources of these materials, reflecting both legacy chemical manufacturing capacity and specialty production for niche industrial applications. Like all PFOS-related substances, these salts are subject to EPA TSCA oversight and may face import restrictions tied to persistent organic pollutant frameworks.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
All other salts of perfluorooctane sulfonic acid not separately enumerated enter under tariff line 2904350000. Goods of Chinese origin in this heading are subject to Section 301 tariffs; Norwegian-origin goods are not subject to Section 301 but should be assessed for any applicable MFN duty.
China's large-scale fluorochemical manufacturing base makes it a volume supplier of PFOS salts broadly, while Norway's presence reflects specialized industrial chemistry capacity, historically linked to electrochemical and specialty surfactant production. Supply concentration in these two countries creates meaningful origin-diversification risk given the evolving regulatory environment around PFAS substances.
Trade Directory
List your company under HS 290435 — Other Salts of Perfluorooctane Sulfonic Acid, so the companies trading it can find you. Be the first supplier listed.
Subheading 8 of 10 in heading 2904
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share |
|---|---|---|---|---|
| 2904350000 | Other Salts of Perfluorooctane Sulfonic Acid | — | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2904350000 | Other Salts of Perfluorooctane Sulfonic Acid | $328K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
—YoY · free account
Exports
—YoY · free account
Low of 2 reported months · imports
Low · free accountFewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through September 2026 · imports 2 of 12 months reported, exports 11 of 12 months reported. Source: U.S. Census Bureau.
Imports · September 2026
origin
customs district
destination
entry
rate provision · imports
None recorded for this period.