Perfluoroalkyl Sulfonamide PFAS Intermediate (EtFOSE) from Mexico
EtFOSE, or N-Ethyl-N-(2-hydroxyethyl)perfluorooctane sulfonamide, serves as a key building block for synthesizing fluorosurfactants and PFAS polymers. Classified under HTS 2935.30.00.00 as it matches the exact sulfonamide description in the tariff, adhering to Chapter 29's scope for separate chemically defined organic compounds. Its perfluorinated structure and substituents define its chemical identity.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Declare exact CAS number (1691-99-2 if applicable) and purity >98% on commercial invoice; check for PFOA/PFOS restrictions under TSCA; store in sealed containers to prevent stabilizer addition that could reclassify