HS code · 6-digit subheading
HS Code 2935.10 – Sulphonamides; N-methylperfluorooctane sulphonamide
HS code 2935.10 is the 6-digit subheading for sulphonamides, N-methylperfluorooctane sulphonamide. It is used for N-methylperfluorooctane sulphonamide (N-MeFOS) and perfluorooctane sulfonamide (PFOSA).
What HS 2935.10 covers
N-methylperfluorooctane sulphonamide (N-MeFOS) is a specific per- and polyfluoroalkyl substance (PFAS) derivative, historically used in various industrial applications due to its excellent water and oil repellency. While its use has been significantly restricted or phased out in many regions due to environmental and health concerns, it remains relevant for understanding historical trade patterns and for specific, highly controlled applications or as a reference standard. Importers and exporters were typically chemical manufacturers and industries involved in surface coatings, textiles, and fire-fighting foams. Today, trade is minimal and highly regulated, often limited to research or specific industrial uses under strict permits. Key things to know include the global regulatory push to eliminate PFAS compounds, the environmental persistence of N-MeFOS, and the shift towards safer alternatives. Its trade is now largely driven by compliance and environmental monitoring rather than widespread industrial application.
- Covers
- N-methylperfluorooctane sulphonamide (N-MeFOS)
- Perfluorooctane sulfonamide (PFOSA)
- Examples
- Historical Scotchgard formulations
- Fire-fighting foams (AFFF components)
- Water-repellent textile treatments
Codes often confused with 2935.10
Common mistake. This code is very specific. It could be confused with other sulfonamides under 2935.90 (other sulfonamides) if the specific N-methylperfluorooctane structure is not identified, or with other PFAS chemicals under different chapters if the sulphonamide functional group is overlooked.
Top exporters and importers of HS code 293510, 2025
In 2025, the largest exporter of HS code 293510 in UN Comtrade data was Spain, with 71% of world exports; the largest importer in UN Comtrade data was Egypt, 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 Spain $2.5M 71% of world exports
- 2 India $271K 7.7% of world exports
- 3 United States $262K 7.5% of world exports
World total: $3.5M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Egypt $8.6M 63% of world imports
- 2 Indonesia $1.4M 10% of world imports
- 3 Ghana $836K 6.1% of world imports
World total: $14M 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 2935.10
Brazil does not split HS 2935.10: its NCM code is 2935.10.00.
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 2935.10
What is HS code 293510?
HS code 293510 is a 6-digit subheading in the Harmonized System that covers: Sulphonamides; N-methylperfluorooctane sulphonamide. N-methylperfluorooctane sulphonamide (N-MeFOS) is a specific per- and polyfluoroalkyl substance (PFAS) derivative, historically used in various industrial applications due to its excellent water and oil repellency. While its use has been significantly restricted or phased out in many regions due to environmental and health concerns, it remains relevant for understanding historical trade patterns and for specific, highly controlled applications or as a reference standard. Importers and exporters were typically chemical manufacturers and industries involved in surface coatings, textiles, and fire-fighting foams. Today, trade is minimal and highly regulated, often limited to research or specific industrial uses under strict permits. Key things to know include the global regulatory push to eliminate PFAS compounds, the environmental persistence of N-MeFOS, and the shift towards safer alternatives. Its trade is now largely driven by compliance and environmental monitoring rather than widespread industrial application.
What products fall under HS code 293510?
N-methylperfluorooctane sulphonamide (N-MeFOS), Perfluorooctane sulfonamide (PFOSA)
What are common misclassifications for HS code 293510?
This code is very specific. It could be confused with other sulfonamides under 2935.90 (other sulfonamides) if the specific N-methylperfluorooctane structure is not identified, or with other PFAS chemicals under different chapters if the sulphonamide functional group is overlooked.
Which countries are the top exporters of goods under HS code 293510?
In 2025, the top exporters of HS code 293510 in UN Comtrade data were Spain ($2.5M, 71% of world exports), India ($271K) and the United States ($262K). World exports came to about $3.5M, 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 293510?
In 2025, the top importers of HS code 293510 in UN Comtrade data were Egypt ($8.6M, 63% of world imports), Indonesia ($1.4M) and Ghana ($836K). World imports came to about $14M, 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 293510 structured?
HS code 293510 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 (10) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293510?
In Brazil, HS code 293510 is NCM 2935.10.00. The last two digits are 00 because Brazil does not split this HS code further.