HS 293510

N-Methyl Perfluorooctane Sulfonamide (N-MeFOSA)

U.S. imports of n-methyl perfluorooctane sulfonamide (n-mefosa) (HS 293510) totaled $0 in April 2026, traded with 1 country.

Last updated: April 2026 data

N-Methyl perfluorooctane sulfonamide (N-MeFOSA) is a perfluoroalkyl substance (PFAS) used historically as a chemical intermediate in the production of surface-treatment agents, and its import is subject to EPA regulatory scrutiny under the Toxic Substances Control Act (TSCA). The sole 10-digit line, 2935100000, captures this specific sulfonamide compound, which is distinct from related PFAS such as PFOS or PFOA despite sharing the perfluorooctane backbone. Italy, Canada, and China are the leading declared source countries for US imports of this compound.

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Exports

$5K

Imports: $0 to 1 country

Surplus of $5K (net exporter)

Trade balance: surplus of $5K (net exporter)

YTD: $3K imported (April 2026)

Top Import Sources

View all

1CANADA$0
0.0%

View all 1 trading partners

Import Trend (12 months)

Monthly import values over time

Geographic Breakdown

NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES

HS 293499

$779.0M

SULPHONAMIDES, NESOI

HS 293590

$132.8M

HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI

HS 293399

$128.7M

CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI

HS 293339

$116.8M

LACTAMS (EXCLUDING 6-HEXANELACTAM) NESOI

HS 293379

$112.1M

COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI

HS 293359

$82.3M

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Frequently Asked Questions

What regulatory requirements apply to importing N-Methyl perfluorooctane sulfonamide into the US?

Imports of N-MeFOSA are subject to EPA's TSCA requirements, which may include TSCA certification at entry (either a positive certification that the chemical complies with TSCA, or a negative certification that it is not subject to TSCA). Given ongoing regulatory attention to PFAS compounds broadly, importers should consult with a licensed customs broker and environmental counsel before importing.

How does N-MeFOSA differ from PFOS for classification and regulatory purposes?

While both are perfluorooctane-based compounds, N-MeFOSA is a sulfonamide intermediate rather than a sulfonate salt, and it has its own dedicated HTS line (2935100000) in Chapter 29. PFOS and related salts are classified elsewhere and are subject to different — and generally more restrictive — regulatory controls under both US and international frameworks.