HS code · 6-digit subheading
HS Code 2935.40 – Sulphonamides; N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide
HS code 2935.40 is the 6-digit subheading for sulphonamides, N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide. It is used for N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide (technical grade), related PFAS intermediates and analytical standards of N-MeFOSE.
What HS 2935.40 covers
This HS code is dedicated to N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide, another specific per- and polyfluoroalkyl substance (PFAS). Similar to other compounds in this class, it was historically valued for its unique chemical properties, such as water and oil repellency, finding applications in various industrial and consumer products. However, due to its environmental persistence, bioaccumulation potential, and associated health risks, global trade and use of this specific sulfonamide are under severe scrutiny and increasing regulatory restrictions. Specialty chemical companies are the primary entities involved in its trade, but the market is contracting significantly as industries seek and adopt safer, non-PFAS alternatives. Strict adherence to international and national environmental regulations is critical for any remaining trade.
- Covers
- N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide (technical grade)
- Related PFAS intermediates
- Analytical standards of N-MeFOSE
- Examples
Historically used in some DuPont products (e.g., Teflon, though formulations changed), specific research chemicals from specialized suppliers
Codes often confused with 2935.40
Common mistake. This compound can be confused with other sulfonamides in 2935.90 or other perfluorinated compounds in 2903, particularly if the precise chemical structure is not verified.
Top exporters and importers of HS code 293540, 2025
In 2025, the largest exporter of HS code 293540 in UN Comtrade data was Germany, with 39% of world exports; the largest importer in UN Comtrade data was the Philippines, with 29% 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 Germany $8K 39% of world exports
- 2 Indonesia $7K 35% of world exports
- 3 United States $3K 16% of world exports
World total: $19K Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Philippines $8K 29% of world imports
- 2 Egypt $6K 22% of world imports
- 3 United States $5K 19% of world imports
World total: $26K 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 2935.40
Brazil does not split HS 2935.40: its NCM code is 2935.40.00.
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 2935.40
What is HS code 293540?
HS code 293540 is a 6-digit subheading in the Harmonized System that covers: Sulphonamides; N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide. This HS code is dedicated to N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide, another specific per- and polyfluoroalkyl substance (PFAS). Similar to other compounds in this class, it was historically valued for its unique chemical properties, such as water and oil repellency, finding applications in various industrial and consumer products. However, due to its environmental persistence, bioaccumulation potential, and associated health risks, global trade and use of this specific sulfonamide are under severe scrutiny and increasing regulatory restrictions. Specialty chemical companies are the primary entities involved in its trade, but the market is contracting significantly as industries seek and adopt safer, non-PFAS alternatives. Strict adherence to international and national environmental regulations is critical for any remaining trade.
What products fall under HS code 293540?
N-(2-hydroxyethyl)-N-methylperfluorooctane sulphonamide (technical grade), related PFAS intermediates, analytical standards of N-MeFOSE
What are common misclassifications for HS code 293540?
This compound can be confused with other sulfonamides in 2935.90 or other perfluorinated compounds in 2903, particularly if the precise chemical structure is not verified.
Which countries are the top exporters of goods under HS code 293540?
In 2025, the top exporters of HS code 293540 in UN Comtrade data were Germany ($8K, 39% of world exports), Indonesia ($7K) and the United States ($3K). World exports came to about $19K, 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 293540?
In 2025, the top importers of HS code 293540 in UN Comtrade data were the Philippines ($8K, 29% of world imports), Egypt ($6K) and the United States ($5K). World imports came to about $26K, 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 293540 structured?
HS code 293540 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 (40) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293540?
In Brazil, HS code 293540 is NCM 2935.40.00. The last two digits are 00 because Brazil does not split this HS code further.