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N-Ethylperfluorooctane Sulfonamide (EtFOSA)

EtFOSA serves as a degradation product marker and synthetic intermediate in PFAS research. Meets HTS 2935.50.00.00 criteria as a separate, chemically defined perfluorooctane sulfonamide.

Import Duty Rates by Country of Origin

Origin Country	MFN Rate	Ch.99 Surcharges	Total Effective Rate
🇨🇳China	6.5%	—	6.5%
🇲🇽Mexico	6.5%	—	6.5%
🇨🇦Canada	6.5%	—	6.5%
🇩🇪Germany	6.5%	—	6.5%
🇯🇵Japan	6.5%	—	6.5%

Alternative Classifications

This product could be classified differently depending on its characteristics or intended use.

2935.20.00.00Higher: 16.5% vs 6.5%

If containing additional thioether linkages

Sulfenamides classify under separate 2935.20 provision.

3822.90.00.00Higher: 10% vs 6.5%

If diagnostic reagents containing the compound

Lab reagents exclude from Chapter 29.

2933.99.97.01Same rate: 6.5%

If cyclic sulfonamide derivatives

Heterocyclic forms classify under 2933 occurring later.

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Import Tips & Compliance

• Provide isotope dilution mass spec data for trace analysis grade material

• Segregate from flammable solvents during transport

• Declare <0.1% PFOA impurities per EPA method 533

Related Products under HTS 2935.50.00.00

N-Ethylperfluorooctane Sulfonamide

N-Ethylperfluorooctane sulfonamide (N-EtPFOSA) is a chemically defined perfluorooctane sulfonamide used primarily as an intermediate in the synthesis of fluorosurfactants. It falls under HTS 2935.50.00.00 as it is specifically listed among other perfluorooctane sulfonamides, which are organo-sulfur compounds with the characteristic sulfonamide group.

N-Methylperfluorooctane Sulfonamide

N-Methylperfluorooctane sulfonamide (N-MePFOSA) is a separate chemically defined compound used in manufacturing water- and oil-repellent coatings. Classified under HTS 2935.50.00.00 as a perfluorooctane sulfonamide per Chapter 29 note (a).

N-Ethyl-N-(2-hydroxyethyl)perfluorooctane Sulfonamide

This hydroxyethyl-substituted perfluorooctane sulfonamide serves as a reactive intermediate for fluoropolymer synthesis. It qualifies under HTS 2935.50.00.00 as 'other perfluorooctane sulfonamides' meeting Chapter 29's chemically defined organic compound criteria.