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HSChapter 29
U.S. exports of perfluorooctane sulfonic acid (pfos) (HS 290431) totaled $5K in December 2024, traded with 1 country.
Perfluorooctane 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
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.
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Monthly import values over time
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
BENZENE
HS 290220
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
HETEROCYCLIC COMP WITH UNFUSED PYRAZOLE RING NESOI
HS 293319
| Port | Imports | Exports | Balance |
|---|---|---|---|
| JACKSONVILLE, FL | -- | -- | -- |