N-Ethyl Perfluorooctane Sulfonamide (N-EtPFOSA)
N-Ethyl perfluorooctane sulfonamide is a chemically defined perfluoroalkyl sulfonamide compound used primarily as an intermediate in the synthesis of fluorochemical surfactants and repellents. It falls under HTS 2935.20.00.00 as a specific sulfonamide within Chapter 29, meeting the criteria for separate chemically defined organic compounds containing sulfur directly linked to carbon. This classification applies to its pure form, whether with stabilizers for transport or safety additives that do not alter its general use.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported as an aqueous solution exceeding transport-only concentrations
Solutions beyond normal safety/transport dilutions fall under Chapter 38 as chemical preparations, per Chapter 29 exclusion in note (e).
If classified primarily by perfluoroalkyl chain without sulfonamide emphasis
Perfluorinated compounds may shift to sulfonated derivatives in heading 2904 if not specifically identified as sulfonamides under the last numerical order rule.
If containing additional organo-sulfur functionalities beyond the sulfonamide group
Organo-sulfur compounds with extra sulfur-carbon links classify under 2930 per Chapter notes, taking precedence if more specific than 2935.
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Import Tips & Compliance
• Verify chemical purity and provide Certificate of Analysis (CoA) to confirm it meets the definition of a separate chemically defined compound under Chapter 29 note (a)
• Include Safety Data Sheets (SDS) detailing any stabilizers or anti-dusting agents, ensuring they comply with Chapter 29 note (f) or (g) without rendering it specific-use
• Avoid common pitfalls like misclassification as mixtures; declare exact CAS number (4151-50-2) and PFAS content for EPA TSCA compliance
Related Products under HTS 2935.20.00.00
N-Ethyl Perfluorooctane Sulfonamide with Stabilizer
This is N-ethyl perfluorooctane sulfonamide formulated with an added stabilizer for preservation during transport, maintaining its identity as a chemically defined organic compound. Classified under HTS 2935.20.00.00 per Chapter 29 note (f), as the stabilizer is necessary and does not change its general chemical use. Commonly used in producing water-resistant coatings and as a PFAS intermediate.
99% Pure N-EtPFOSA Technical Grade
High-purity N-ethyl perfluorooctane sulfonamide (99% pure) supplied as a technical grade chemical for industrial synthesis of fluoropolymers. It qualifies under HTS 2935.20.00.00 as a separate chemically defined sulfonamide, containing impurities within allowable limits per Chapter 29 note (a). Used in manufacturing oil-repellent textiles.
N-Ethyl Perfluorooctane Sulfonamide Ethanol Solution
N-Ethyl perfluorooctane sulfonamide dissolved in ethanol at standard transport concentration for safety reasons, remaining classifiable as the pure compound. Falls under HTS 2935.20.00.00 per Chapter 29 note (e), as the solvent is solely for transport and not specific use. Applied in formulating stain-resistant finishes.