U.S. exports of Perfluorooctane Sulfonic Acid (PFOS) (HS 290431) totaled $5K in December 2024, exported to 1 country.
Last updated: December 2024 dataPerfluorooctane sulfonic acid (PFOS) is a per- and polyfluoroalkyl substance (PFAS) subject to severe international restrictions under the Stockholm Convention Annex B and EPA regulatory action under TSCA, making commercial import into the United States effectively limited to narrow exempted uses such as certain semiconductor manufacturing processes. Classified under a single US tariff line (2904310000), PFOS imports require close coordination with EPA before entry, and importers should be prepared to document the specific exempted application. The heading's creation as a standalone six-digit code reflects the compound's distinct regulatory status relative to other sulfonated derivatives.
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PFOS is subject to TSCA Section 5 and EPA's PFAS regulatory framework, which restricts its manufacture, import, processing, and use. EPA has issued Significant New Use Rules (SNURs) covering PFOS, meaning that any use not previously approved requires a Significant New Use Notice (SNUN) before import. Importers must confirm that their specific end use is either an existing approved use or obtain EPA clearance in advance. Engaging a regulatory attorney or licensed customs broker with PFAS experience is strongly recommended.
PFOS (2904310000) is the free acid form, while ammonium perfluorooctane sulfonate (heading 290432) is the ammonium salt. They are chemically distinct substances with different CAS numbers and classify under separate six-digit headings. The distinction matters because regulatory exemptions and restrictions may differ between the acid and its salts, so the supplier's certificate of analysis must confirm the exact chemical form.
Subheading 6 of 10 in heading 2904
Subheading 290431 · $5K of $12.3M
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Imports
Imports
—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 December 2024 · imports 2 of 12 months reported. Source: U.S. Census Bureau.
Exports · December 2024
destination
Japan and Dominican Republic together take 100% of it.
customs district
origin
entry
rate provision · imports
None recorded for this period.