HS 293391 Other
Quick Answer: HS code 293391, "Other," covers a diverse range of heterocyclic compounds with nitrogen hetero-atom(s) only, not elsewhere specified or included within Chapter 29. This residual classification captures various complex organic chemicals used in pharmaceuticals, agrochemicals, and specialized industrial applications. Duty rates vary significantly by jurisdiction and specific product. For example, the UK and EU generally apply a 0.00% ad valorem duty for most entries under this code. In contrast, the US tariff schedule shows a wide range, including "Free" for some items, but also complex rates like 15.4¢/kg + 149.5% ad valorem for others. Importers and customs brokers must meticulously classify specific products to avoid misdeclaration, as the "Other" designation necessitates careful review of chemical structure and intended use against more specific subheadings.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933911000 | 0.00 % | — | — |
| 2933910000 | — | — | — |
| 2933919000 | 0.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933910000 | — | — | — |
| 2933911000 | 0.00 % | — | — |
| 2933919000 | 0.00 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 29339100 | Free | — | — |
| 2933910050 | — | — | ["kg"] |
| 2933910010 | — | — | ["kg"] |
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.
How Has Trade Volume Developed?
Trade Volume 2023
How to Classify This HS Code?
What products does HS 293391 cover?
This subheading covers compounds containing an unfused pyridine ring (whether or not hydrogenated) in their structure, but not further specified or included in other subheadings of Heading 2933. Specifically, HS 293391, titled "Other," encompasses a residual category for heterocyclic compounds with nitrogen hetero-atom(s) only, where the nitrogen atom is part of a pyridine ring system, and these compounds are not specifically provided for elsewhere. This aligns with the World Customs Organization (WCO) Harmonized System Explanatory Notes for Chapter 29 and is consistently reflected in the USITC Harmonized Tariff Schedule (HTS) and the EU TARIC system, ensuring a uniform application for various pyridine derivatives not explicitly enumerated.
What falls outside HS 293391?
The following products are excluded from HS 293391: compounds with a quinoline or isoquinoline ring system (e.g., quinoline itself, classified under 2933.49), compounds with a pyrimidine ring (e.g., barbituric acid, classified under 2933.5X), and compounds with a piperazine ring (e.g., piperazine, classified under 2933.5X). Additionally, compounds where the nitrogen hetero-atom is part of an unfused imidazole or pyrazole ring (e.g., imidazole, classified under 2933.29) are excluded. This subheading specifically targets pyridine derivatives not covered by more specific subheadings within Heading 2933, emphasizing the importance of identifying the precise heterocyclic ring system present.
What are common classification mistakes for HS 293391?
A common error is misclassifying pyridine derivatives that contain additional, more specific heterocyclic ring systems or functional groups that would lead to classification under a different subheading within Heading 2933 or even another chapter. For instance, a compound containing both a pyridine ring and a pyrimidine ring might be incorrectly placed in 293391 instead of a more specific pyrimidine subheading. Another mistake involves overlooking the "unfused" criterion, leading to the incorrect inclusion of fused ring systems. Proper application of General Interpretative Rule (GRI) 1, which prioritizes the terms of the headings and section or chapter notes, is crucial to avoid these errors, ensuring the most specific description takes precedence.
How should importers classify products under HS 293391?
The correct procedure for classifying products under HS 293391 involves a systematic analysis of the chemical structure. Importers and customs brokers must first confirm the presence of an unfused pyridine ring as the primary nitrogen-containing heterocyclic system. Subsequently, they must meticulously review all other subheadings within Heading 2933 to ensure the compound is not more specifically described elsewhere, such as under subheadings for quinoline, pyrimidine, or imidazole derivatives. Consulting the WCO Explanatory Notes for Chapter 29 and cross-referencing with the USITC HTS and EU TARIC chemical annexes is essential. When no more specific provision applies, and the compound meets the general description of pyridine derivatives, classification under 293391 is appropriate, adhering to GRI 6 for subheading determination.
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FAQ
What are the typical Most Favored Nation (MFN) duty rates for products classified under HS 2933.91, and how do they vary internationally?
HS 2933.91 covers 'Other' compounds containing an unfused pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure. MFN duty rates for this specific subheading can vary significantly by importing country. For instance, the United States (USITC) generally applies a 'Free' duty rate for MFN imports under 2933.91.00.00. The European Union (EU TARIC) also typically applies a 0.00% ad valorem duty rate. Similarly, the UK Global Tariff (UKGT) lists a 0.00% ad valorem duty for this code. However, it is crucial to verify the specific country of import's tariff schedule, as some nations may apply duties, such as the example of '15.4¢/kg + 149.5%' which could apply in specific non-MFN or retaliatory tariff scenarios, though not typical for MFN. Importers should consult the official tariff database of the destination country for the most accurate and up-to-date information.
What are the key classification criteria for determining if a chemical compound falls under HS 2933.91, particularly distinguishing it from other subheadings within Chapter 29?
Classification under HS 2933.91 is determined by the specific chemical structure of the compound. This subheading is for 'Other' heterocyclic compounds containing an unfused pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure, not elsewhere specified in subheadings 2933.52 through 2933.59. The primary criterion is the presence of either an unfused pyrimidine ring or a piperazine ring as the defining heterocyclic element, provided it's not a nucleic acid or a derivative thereof (which would fall under 2934), and not specifically listed in other more granular subheadings within 2933 (e.g., 2933.53 for Malonylurea (barbituric acid) and its salts). Importers and customs brokers must ensure the chemical's structural formula precisely matches this description and does not meet the criteria for a more specific heading or subheading in Chapter 29.
Which common trade agreements offer preferential duty rates for products classified under HS 2933.91, and what documentation is typically required to claim these benefits?
Given that many major economies, including the U.S., EU, and UK, already apply a 0.00% or 'Free' MFN duty rate to HS 2933.91, the direct impact of preferential trade agreements on duty rates for this specific code may be limited in those markets. However, for countries that do apply MFN duties, agreements such as the North American Free Trade Agreement (NAFTA) successor, the United States-Mexico-Canada Agreement (USMCA), or various Free Trade Agreements (FTAs) between the EU and other nations (e.g., EU-Korea FTA, EU-Japan EPA) could offer duty reductions or eliminations. To claim preferential duty rates, importers typically need to provide a Certificate of Origin (e.g., USMCA Certificate of Origin, EUR.1 movement certificate, or a declaration of origin on the commercial invoice). This documentation verifies that the goods meet the specific rules of origin criteria outlined in the respective trade agreement, which often involves a minimum percentage of regional value content or a change in tariff classification.
Are there any specific import documentation requirements or regulatory considerations beyond standard customs declarations for chemical compounds under HS 2933.91?
Beyond standard customs declarations (e.g., commercial invoice, packing list, bill of lading/air waybill), chemical compounds under HS 2933.91 may be subject to additional regulatory requirements depending on their specific end-use, toxicity, and the importing country's chemical control laws. For instance, in the United States, the Toxic Substances Control Act (TSCA) may require specific certifications or notifications for new or existing chemical substances. In the EU, the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulation mandates registration for substances manufactured or imported in quantities exceeding one tonne per year. Importers may need to provide Safety Data Sheets (SDS), certificates of analysis, or comply with specific labeling requirements. It is crucial for importers to verify with the relevant national chemical regulatory authorities (e.g., EPA in the US, ECHA in the EU) if their specific compound requires any pre-market notification, registration, or permits prior to import.