Perfluoroalkyl Sulfonamide PFAS Intermediate (EtFOSE)
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing direct sulfur-to-carbon linkages beyond sulfonamide without nitrogen substitution
Organo-sulfur compounds in heading 2930 precede sulfonamides (2935); pure sulfur compounds without N-functions classify earlier per Chapter 29 numerical order rule.
If for the corresponding perfluorooctanesulfonic acid precursor before amidation
The acid form without the amide nitrogen substituent falls under halogenated sulfonic acids in 2903, as sulfonamides specifically require the nitrogen function in 2935.
If imported as a diluted preparation for dye production
Chapter 29 note (h) allows dilution for azo dyes in 2935, but other preparations classify in 3824 as chemical preparations not elsewhere specified.
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Import Tips & Compliance
• 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
Related Products under HTS 2935.30.00.00
N-Ethyl-N-(2-Hydroxyethyl)perfluorooctane Sulfonamide
This is a specific perfluorinated sulfonamide compound with the chemical formula featuring a perfluorooctane chain attached to the sulfonamide group, along with N-ethyl and N-(2-hydroxyethyl) substituents. It falls under HTS 2935.30.00.00 as a chemically defined sulfonamide per Chapter 29 notes (a), used primarily in surfactants and fluorochemical applications. The compound's structure qualifies it directly under the subheading for this exact substance.
Fluorochemical Surfactant Building Block N-EtFOSE
N-EtFOSE is a fluorinated sulfonamide used as an intermediate in producing water- and oil-repellent coatings. It precisely matches HTS 2935.30.00.00 for N-Ethyl-N-(2-hydroxyethyl)perfluorooctane sulfonamide, a separate chemically defined compound under Chapter 29. The perfluoro chain and hydroxyethyl group characterize its sulfonamide classification.
High-Purity EtFOSE for Polymer Synthesis
This high-purity grade of N-Ethyl-N-(2-hydroxyethyl)perfluorooctane sulfonamide is optimized for polymerization into fluoropolymers. It is classified under HTS 2935.30.00.00 as the exact named sulfonamide, fitting Chapter 29's criteria for chemically defined organic compounds without impurities affecting classification. Used in surface treatment formulations.
Technical Grade Perfluorooctane Sulfonamide (N-Ethyl Hydroxyethyl)
Technical grade version contains minor impurities but remains the named N-Ethyl-N-(2-hydroxyethyl)perfluorooctane sulfonamide per Chapter 29 note (a). Classified in HTS 2935.30.00.00 for use in industrial wetting agents and emulsifiers. The principal compound defines the tariff heading.
PFOS-Derivative Sulfonamide for Textile Finishing
A PFOS-related sulfonamide, N-Ethyl-N-(2-hydroxyethyl)perfluorooctane sulfonamide, used in textile repellency treatments. Directly under HTS 2935.30.00.00 as a sulfonamide matching the subheading description and Chapter 29 purity standards. Its chemical definition prevails over application.