HS code · 6-digit subheading
HS Code 2935.50 – Sulphonamides; other perfluorooctane sulphonamides
HS code 2935.50 is the 6-digit subheading for sulphonamides, other perfluorooctane sulphonamides. It is used for perfluorooctane sulfonic acid (PFOS), potassium perfluorooctane sulfonate, ammonium perfluorooctane sulfonate, lithium perfluorooctane sulfonate and N-Ethylperfluorooctane sulfonamidoethanol.
What HS 2935.50 covers
This HS code covers perfluorooctane sulphonamides (PFOS) and their derivatives, which are a specific class of synthetic organic chemicals known for their unique properties like water and oil repellency. Historically, these compounds were widely used in various industrial applications, including fire-fighting foams, surface coatings for textiles and paper, and in some specialized chemical processes. However, due to their persistence in the environment, bioaccumulation, and potential toxicity, many countries have implemented strict regulations or outright bans on their production and use. International trade in these substances is now highly restricted, primarily involving specialized chemical manufacturers and distributors for legacy applications or for destruction. Importers and exporters must navigate complex environmental and health regulations, making compliance a critical aspect of any trade activity. The market for these specific compounds is shrinking due to global efforts to phase out persistent organic pollutants.
- Covers
- Perfluorooctane sulfonic acid (PFOS)
- Potassium perfluorooctane sulfonate
- Ammonium perfluorooctane sulfonate
- Lithium perfluorooctane sulfonate
- N-Ethylperfluorooctane sulfonamidoethanol
- Examples
- 3M (historically Scotchgard)
- DuPont (historically Teflon)
- Chemours
- Daikin
- Solvay
Codes often confused with 2935.50
Common mistake. These can be confused with other sulphonamides under 293590, or other fluorinated organic compounds in Chapter 29, particularly if their specific perfluorooctane structure is not clearly identified.
Top exporters and importers of HS code 293550, 2025
In 2025, the largest exporter of HS code 293550 in UN Comtrade data was India, with 59% of world exports; the largest importer in UN Comtrade data was the United Arab Emirates, with about 23% 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 $2.3M 59% of world exports
- 2 Spain $1.5M 38% of world exports
- 3 United States $91K 2.3% of world exports
World total: $4.0M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United Arab Emirates* ~$1.3M 23% of world imports · partner records ↗
- 2 United States $1.2M 21% of world imports
- 3 India $981K 18% of world imports
World total: $5.6M 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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 2935.50
Brazil does not split HS 2935.50: its NCM code is 2935.50.00.
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 2935.50
What is HS code 293550?
HS code 293550 is a 6-digit subheading in the Harmonized System that covers: Sulphonamides; other perfluorooctane sulphonamides. This HS code covers perfluorooctane sulphonamides (PFOS) and their derivatives, which are a specific class of synthetic organic chemicals known for their unique properties like water and oil repellency. Historically, these compounds were widely used in various industrial applications, including fire-fighting foams, surface coatings for textiles and paper, and in some specialized chemical processes. However, due to their persistence in the environment, bioaccumulation, and potential toxicity, many countries have implemented strict regulations or outright bans on their production and use. International trade in these substances is now highly restricted, primarily involving specialized chemical manufacturers and distributors for legacy applications or for destruction. Importers and exporters must navigate complex environmental and health regulations, making compliance a critical aspect of any trade activity. The market for these specific compounds is shrinking due to global efforts to phase out persistent organic pollutants.
What products fall under HS code 293550?
Perfluorooctane sulfonic acid (PFOS), Potassium perfluorooctane sulfonate, Ammonium perfluorooctane sulfonate, Lithium perfluorooctane sulfonate, N-Ethylperfluorooctane sulfonamidoethanol
What are common misclassifications for HS code 293550?
These can be confused with other sulphonamides under 293590, or other fluorinated organic compounds in Chapter 29, particularly if their specific perfluorooctane structure is not clearly identified.
Which countries are the top exporters of goods under HS code 293550?
In 2025, the top exporters of HS code 293550 in UN Comtrade data were India ($2.3M, 59% of world exports), Spain ($1.5M) and the United States ($91K). World exports came to about $4.0M, 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 293550?
In 2025, the top importers of HS code 293550 in UN Comtrade data were the United Arab Emirates (about $1.3M, 23% of world imports), the United States ($1.2M) and India ($981K). World imports came to about $5.6M, 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 293550 structured?
HS code 293550 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 (50) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293550?
In Brazil, HS code 293550 is NCM 2935.50.00. The last two digits are 00 because Brazil does not split this HS code further.