HS 293550 Other perfluorooctane sulphonamides
Quick Answer: HS code 293550 specifically covers "Other perfluorooctane sulphonamides." In plain language, this refers to a group of synthetic organic chemical compounds characterized by a perfluorooctane chain and a sulphonamide functional group, excluding those more specifically classified elsewhere. These chemicals have historically been used in various industrial applications due to their unique surfactant properties, though their use is now heavily regulated due to environmental and health concerns. For importers and exporters, understanding the duty rates is crucial. The UK applies a 6.00% ad valorem duty, while the EU TARIC system lists a 6.50% ad valorem rate. In the US, the general most-favored-nation (MFN) duty rate is 6.5% ad valorem. However, significant preferential duty treatment is available, with many countries (e.g., Australia, Chile, Korea, Singapore) qualifying for duty-free entry under various free trade agreements (indicated by "Free" with specific program indicators like A+, AU). For non-MFN countries, a prohibitive rate of 15.4¢/kg + 57.5% applies. Importers must verify product-specific eligibility for preferential tariffs and ensure compliance with all applicable chemical regulations, including those related to persistent organic pollutants (POPs).
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2935500000 | 6.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2935500000 | 6.50 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2935500000 | 6.5% | Free (17 programs) | ["kg"] |
Special rates available under trade agreements including USMCA, KORUS, GSP.
Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).
Data compiled and presented by HSRates.
Which Trade Agreements Reduce Duties for HS 2935.50?
Imports of Other perfluorooctane sulphonamides may qualify for reduced or zero duty rates under free trade agreements and preferential programs. The overview below shows available preferential arrangements by jurisdiction, compiled by HSRates from official tariff and trade agreement data.
United States (HTSUS)
Free for USMCA, KORUS, and 15 other programs
European Union (TARIC)
Preferential rate data not yet available.
United Kingdom
Preferential rate data not yet available.
Preferential rates require proof of origin and may be subject to quotas or conditions. Always verify eligibility with a licensed customs broker.
Data compiled by HSRates.
Which Preferential Rates Apply to Your Origin Country?
Select an origin country to see if preferential rates apply.
Preferential rates based on available trade agreements. Actual rates may vary.
How Has Trade Volume Developed?
Trade Volume 2023
How to Classify This HS Code?
What products does HS 293550 cover?
This subheading covers "Other perfluorooctane sulphonamides," specifically referring to chemical compounds that are derivatives of perfluorooctane sulfonic acid (PFOS) where the sulfonic acid group is replaced by a sulfonamide group, and which are not specifically provided for in other subheadings of Heading 2935. As per the Harmonized System Nomenclature, Heading 2935 encompasses "Sulfonamides," which are organic compounds containing the -SO2NH2 group. Subheading 293550 is a residual category for perfluorooctane sulfonamides not covered by more specific subheadings, as defined by the USITC Harmonized Tariff Schedule (HTS) and EU TARIC classifications, ensuring proper distinction from other sulfonamide types.
What falls outside HS 293550?
The following products are excluded from HS 293550: perfluorooctane sulfonic acid (PFOS) itself, which is classified under Heading 2904 as a sulfonated derivative of hydrocarbons, or its salts and esters, which would also fall under 2904 or other specific headings depending on their chemical structure. Additionally, other sulfonamides that are not perfluorooctane derivatives, such as sulfadiazine or sulfamethoxazole, are classified under other specific subheadings within Heading 2935, for example, 2935.10 for sulfamethoxazole or 2935.20 for sulfadiazine, as they are distinct chemical entities. Polymers containing perfluorooctane sulfonamide units, if they meet the criteria for plastics, would typically be classified in Chapter 39, not Chapter 29.
What are common classification mistakes for HS 293550?
A common error is misclassifying perfluorooctane sulfonic acid (PFOS) or its salts directly into 293550, when these are correctly classified under Heading 2904 as sulfonated derivatives, not sulfonamides. Another frequent mistake involves classifying other types of sulfonamides, such as those used as pharmaceuticals, into this subheading, despite them having specific provisions elsewhere in Heading 2935 (e.g., 2935.10 or 2935.20). This often occurs due to a lack of precise chemical identification, failing to differentiate between a "sulfonamide" and a "sulfonic acid" or other sulfonated derivatives. Adherence to General Interpretative Rule (GRI) 1, which dictates classification by the terms of the headings and any relative section or chapter notes, is crucial to avoid such errors.
How should importers classify products under HS 293550?
The correct procedure for classifying products under HS 293550 requires a thorough understanding of the chemical structure of the imported substance. Importers and customs brokers must first confirm that the product is indeed a sulfonamide and specifically a perfluorooctane derivative, not a sulfonic acid or other sulfonated compound. This involves reviewing the chemical name, CAS number, and chemical formula. Next, verify that the specific perfluorooctane sulfonamide is not more specifically provided for in another subheading within Heading 2935. If it is an "other" perfluorooctane sulfonamide, then 293550 is appropriate. Consulting the WCO Explanatory Notes for Chapter 29 and obtaining a binding ruling from the relevant customs authority (e.g., CBP in the US, national customs authorities in the EU) for complex cases is highly recommended to ensure accuracy and compliance.
Which HS Codes Are Related?
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FAQ
What are the standard Most Favored Nation (MFN) import duty rates for HS code 293550, 'Other perfluorooctane sulphonamides'?
The MFN import duty rates for HS code 293550 can vary significantly by importing country. For example, the United States applies a duty rate of 6.5% ad valorem. The European Union's TARIC database indicates a general MFN duty rate of 6.5% ad valorem. The UK Global Tariff also lists a 6.5% ad valorem rate. Some countries may apply specific or compound duties; for instance, a hypothetical rate could be 15.4¢/kg + 57.5% ad valorem, though it is crucial to verify the exact rate with the specific country's official tariff schedule (e.g., USITC Harmonized Tariff Schedule, EU TARIC, UK Trade Tariff).
Are there any preferential duty rates available for HS 293550 under common trade agreements, and how can an importer claim them?
Yes, preferential duty rates, including 'Free' rates, are often available for HS 293550 under various free trade agreements (FTAs) or generalized system of preferences (GSP) programs. For instance, the United States offers 'Free' duty rates for goods originating from countries with agreements such as Australia (AU), Bahrain (BH), Chile (CL), Colombia (CO), Israel (IL), Jordan (JO), Korea (KR), Morocco (MA), Oman (OM), Panama (PA), Peru (PE), and Singapore (SG). To claim a preferential duty rate, importers must ensure the goods meet the rules of origin criteria of the specific agreement and provide valid proof of origin (e.g., a certificate of origin, declaration of origin) to customs authorities at the time of import. It is essential to consult the specific trade agreement's text and the importing country's customs regulations for precise requirements.
What are the key classification criteria for 'Other perfluorooctane sulphonamides' under HS 293550, and what distinguishes it from other sulphonamides?
HS code 293550 specifically covers 'Other perfluorooctane sulphonamides.' The primary classification criteria revolve around the chemical structure: the compound must be a sulphonamide (R-SO2-NR'R'') and contain a perfluorooctane group (C8F17-). The 'other' in the description indicates that it covers perfluorooctane sulphonamides not specifically provided for in other subheadings within Chapter 29. The distinction from other sulphonamides (e.g., those in 2935.10, 2935.20, 2935.30, 2935.40) lies in the presence of the perfluorooctane moiety. Importers should ensure their product's chemical name, CAS number, and structural formula clearly identify it as a perfluorooctane sulphonamide to avoid misclassification.
What specific documentation is typically required by customs for the import of goods classified under HS 293550?
For goods classified under HS 293550, standard import documentation includes a commercial invoice, packing list, and bill of lading or air waybill. Additionally, due to the chemical nature of the product, customs authorities may require a Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) to assess any potential regulatory concerns (e.g., environmental, health, or safety). If claiming preferential duty rates, a valid Certificate of Origin or Declaration of Origin is mandatory. Depending on the importing country and specific end-use, further permits or licenses from chemical regulatory bodies may be necessary, particularly if the substance is subject to national chemical control laws (e.g., TSCA in the US, REACH in the EU). Importers should verify all requirements with the customs authority of the importing country prior to shipment.