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N-Ethyl perfluorooctane sulfonamide (N-EtFOSA) is a PFAS-family compound classified under tariff line 2935200000, structurally distinguished from its N-methyl counterpart by the ethyl group on the sulfonamide nitrogen. Like other perfluorooctane sulfonamide derivatives, it falls within EPA's TSCA regulatory framework for PFOS-related substances, and importers must assess Significant New Use Rule applicability prior to entry. China is the sole documented leading supplier to the US market for this compound.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Yes. EPA's TSCA Significant New Use Rules cover PFOS-related compounds including N-EtFOSA. Importers must evaluate whether their intended use constitutes a 'significant new use' requiring advance EPA notification. Additionally, imports from China may be subject to Section 301 tariffs; current applicability should be confirmed with a licensed customs broker.
A certificate of analysis confirming the molecular structure — specifically the ethyl (rather than methyl or hydroxyethyl) substituent on the nitrogen — is essential to distinguish this compound from the adjacent HTS headings 293510, 293530, and 293540. Customs may request this documentation to verify classification at the 10-digit level.
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Subheading 4 of 6 in heading 2935
Subheading 293520 · $0 of $161.3M
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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.
Imports · December 2025
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