Tetraethylammonium perfluorooctane sulfonate (TEAOS) is a PFAS compound historically used in specialty electroplating, semiconductor processing, and certain fire-suppression formulations. EPA's ongoing regulatory actions targeting perfluorooctane sulfonate (PFOS) compounds directly affect the admissibility and end-use of this substance, and importers should verify current Toxic Substances Control Act (TSCA) compliance before shipment. China is the dominant supplier, with Switzerland a secondary source, reflecting the concentration of PFAS chemical manufacturing in Asia alongside Swiss specialty-chemical producers.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Imports of PFOS-related substances fall under EPA's Toxic Substances Control Act (TSCA) framework. Importers must certify TSCA compliance at entry, and certain PFOS uses are subject to EPA significant new use rules (SNURs) or outright restrictions. Consulting an environmental compliance specialist before importation is strongly advised given the evolving regulatory landscape.
Imports of specialty fluorochemicals from China may be subject to Section 301 tariffs. Because rates and product coverage under Section 301 can change, importers should verify the current status of applicable tariff actions against the specific HTS line 2923300000 at the time of entry.
Subheading 4 of 5 in heading 2923
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 |
|---|---|---|---|---|
| 2923300000 | Tetraethylammonium Perfluorooctane Sulfonate | — | -- | -- |
Trade Directory
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ImportsExports
Imports
—YoY · free account
Exports
—YoY · free account
Low of 2 reported months · imports
Low · free accountOver the twelve months to August 2026, the U.S. exported $153K of Tetraethylammonium Perfluorooctane Sulfonate.
Fewer 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 August 2026 · imports 2 of 12 months reported, exports 6 of 12 months reported. Source: U.S. Census Bureau.
Imports · August 2026
origin
customs district
destination
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rate provision · imports
None recorded for this period.