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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If formulated into fire-extinguishing compositions
Chapter 29 excludes preparations for fire extinguishers (note k), shifting to 3813 even if based on sulfonamide compounds.
If the hydroxyethyl group dominates as an amide-derived oxygen function
Certain oxygen-function amides in 2924 follow sulfonamides, but only if not primarily sulfonamide-characterized; numerical order prefers 2935 for sulfonamides.
If chemically modified into peptide-like structures for industrial enzymes
Exclusions for enzyme-related products (Chapter 35) apply if function shifts from pure sulfonamide to peptidase mimicry.
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Import Tips & Compliance
• Include NMR or HPLC data in documentation to prove structural identity; comply with REACH or EPA PFAS reporting if >100 lbs imported; label as 'research chemical' if for lab use to avoid end-use scrutiny
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.
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.
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.