HS code · 6-digit subheading
HS Code 2935.20 – Sulphonamides; N-ethylperfluorooctane sulphonamide
HS code 2935.20 is the 6-digit subheading for sulphonamides, N-ethylperfluorooctane sulphonamide. It is used for N-ethylperfluorooctane sulphonamide (N-EtFOS) and perfluorooctane sulfonamide (PFOSA).
What HS 2935.20 covers
N-ethylperfluorooctane sulphonamide (N-EtFOS) is another specific per- and polyfluoroalkyl substance (PFAS) derivative, similar to N-MeFOS, that was historically used for its surfactant properties and ability to repel water and oil. Its applications spanned textiles, paper coatings, and fire-fighting foams. However, due to growing environmental and health concerns regarding PFAS compounds, its production and use have been severely restricted or banned in many countries. Current trade is highly limited, primarily for research, analytical standards, or very specific, controlled industrial applications under strict regulatory oversight. Importers and exporters were historically chemical companies and industries utilizing surface treatment agents. Key considerations include the global regulatory efforts to phase out PFAS, the environmental persistence of N-EtFOS, and the ongoing search for non-fluorinated alternatives. Trade is now largely driven by environmental monitoring and compliance.
- Covers
- N-ethylperfluorooctane sulphonamide (N-EtFOS)
- Perfluorooctane sulfonamide (PFOSA)
- Examples
- Historical Stainmaster carpet treatments
- Fire-fighting foams (AFFF components)
- Water-resistant paper coatings
Codes often confused with 2935.20
Common mistake. This code is highly specific. It might be confused with other sulfonamides under 2935.90 if the specific N-ethylperfluorooctane structure is not precisely identified, or with other PFAS chemicals if the sulphonamide group is not recognized.
Top exporters and importers of HS code 293520, 2025
In 2025, the largest exporter of HS code 293520 in UN Comtrade data was India, with 59% of world exports; the largest importer in UN Comtrade data was Belgium, with 63% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 India $55K 59% of world exports
- 2 United Kingdom $10K 11% of world exports
- 3 Switzerland $8K 9.1% of world exports
World total: $93K Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Belgium $99K 63% of world imports
- 2 Egypt $26K 17% of world imports
- 3 United States $14K 8.8% of world imports
World total: $157K Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for 2935.20
Brazil does not split HS 2935.20: its NCM code is 2935.20.00.
All Brazil NCM codes in heading 29.35 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2935.20
What is HS code 293520?
HS code 293520 is a 6-digit subheading in the Harmonized System that covers: Sulphonamides; N-ethylperfluorooctane sulphonamide. N-ethylperfluorooctane sulphonamide (N-EtFOS) is another specific per- and polyfluoroalkyl substance (PFAS) derivative, similar to N-MeFOS, that was historically used for its surfactant properties and ability to repel water and oil. Its applications spanned textiles, paper coatings, and fire-fighting foams. However, due to growing environmental and health concerns regarding PFAS compounds, its production and use have been severely restricted or banned in many countries. Current trade is highly limited, primarily for research, analytical standards, or very specific, controlled industrial applications under strict regulatory oversight. Importers and exporters were historically chemical companies and industries utilizing surface treatment agents. Key considerations include the global regulatory efforts to phase out PFAS, the environmental persistence of N-EtFOS, and the ongoing search for non-fluorinated alternatives. Trade is now largely driven by environmental monitoring and compliance.
What products fall under HS code 293520?
N-ethylperfluorooctane sulphonamide (N-EtFOS), Perfluorooctane sulfonamide (PFOSA)
What are common misclassifications for HS code 293520?
This code is highly specific. It might be confused with other sulfonamides under 2935.90 if the specific N-ethylperfluorooctane structure is not precisely identified, or with other PFAS chemicals if the sulphonamide group is not recognized.
Which countries are the top exporters of goods under HS code 293520?
In 2025, the top exporters of HS code 293520 in UN Comtrade data were India ($55K, 59% of world exports), the United Kingdom ($10K) and Switzerland ($8K). World exports came to about $93K, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 293520?
In 2025, the top importers of HS code 293520 in UN Comtrade data were Belgium ($99K, 63% of world imports), Egypt ($26K) and the United States ($14K). World imports came to about $157K, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 293520 structured?
HS code 293520 is a 6-digit subheading under the Harmonized System. The first 2 digits (29) identify the chapter, digits 3-4 (35) identify the heading, and digits 5-6 (20) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293520?
In Brazil, HS code 293520 is NCM 2935.20.00. The last two digits are 00 because Brazil does not split this HS code further.