HS 293331 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure
Quick Answer: HS code 2933.31 covers chemical compounds characterized by the presence of an unfused pyridine ring in their molecular structure, which may or may not be hydrogenated. This includes a range of organic chemicals, often intermediates in pharmaceutical or agrochemical manufacturing, but excludes specific derivatives classified elsewhere. For importers and exporters, understanding the duty landscape is crucial: the UK applies a 4.00% ad valorem duty, while the EU imposes 5.30%. In contrast, the United States generally applies a "Free" duty rate for products falling under this classification. Importers should verify specific product classifications and applicable preferential trade agreements, as these can significantly impact landed costs and market competitiveness.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933310000 | 4.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933310000 | 5.30 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933310000 | Free | — | ["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 to Classify This HS Code?
What products does HS 293331 cover?
This subheading covers chemical compounds that incorporate an unfused pyridine ring within their molecular structure, regardless of whether that ring is hydrogenated. This classification is derived directly from the World Customs Organization (WCO) Harmonized System (HS) Nomenclature, specifically Chapter 29, which deals with organic chemicals. Examples include pyridine and its derivatives, such as alpha-picoline, beta-picoline, and gamma-picoline, as well as 2,6-lutidine. The key criterion for inclusion under HS 293331 is the presence of the unfused pyridine ring, which distinguishes these compounds from those with fused ring systems or other nitrogen heterocycles. Both the USITC Harmonized Tariff Schedule (HTS) and the EU TARIC system align with this WCO definition for the scope of this subheading.
What falls outside HS 293331?
The following products are excluded from HS 293331: compounds where the pyridine ring is fused with other rings, which would typically fall under other subheadings within Heading 2933 or even other headings depending on the specific fused system. For instance, quinoline and isoquinoline, which contain a fused pyridine ring, are classified under HS 293349. Additionally, heterocyclic compounds with nitrogen atoms that are not part of a pyridine ring, such as pyrazoles or imidazoles, are classified elsewhere within Heading 2933 (e.g., HS 293311 for phenazone and its derivatives, or HS 293321 for hydantoin and its derivatives). Alkaloids, even if they contain a pyridine ring, are generally classified under Heading 2939, as they are specifically provided for there.
What are common classification mistakes for HS 293331?
A common error is misclassifying compounds with fused pyridine rings under HS 293331, failing to recognize the "unfused" criterion. Importers might incorrectly classify quinoline or isoquinoline here, despite their explicit provision under HS 293349. Another frequent mistake involves overlooking the specific provisions for certain nitrogen-heterocyclic compounds elsewhere in Chapter 29, such as alkaloids in Heading 2939, even if they possess a pyridine structure. This often violates General Interpretative Rule (GRI) 1, which states that classification is determined according to the terms of the headings and any relative section or chapter notes. Furthermore, failing to correctly identify the presence and nature (unfused vs. fused) of the pyridine ring through chemical analysis or structural diagrams can lead to incorrect assignments.
How should importers classify products under HS 293331?
The correct procedure for classifying products under HS 293331 involves a meticulous review of the chemical structure to confirm the presence of an unfused pyridine ring. Importers and customs brokers should first consult the WCO HS Explanatory Notes for Heading 2933 to understand the precise scope and exclusions. Next, verify that the compound does not have a fused pyridine ring system, which would direct it to other subheadings like HS 293349. It is crucial to ensure the product is not specifically provided for elsewhere in Chapter 29, such as under Heading 2939 for alkaloids. Obtaining a Certificate of Analysis or a detailed chemical structure diagram from the manufacturer is highly recommended to substantiate the classification, ensuring compliance with both USITC HTS and EU TARIC regulations.
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FAQ
What are the typical Most Favored Nation (MFN) import duty rates for products classified under HS 2933.31 in major trading blocs?
The MFN (Most Favored Nation) import duty rates for HS 2933.31, which covers 'Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure,' vary by country or customs union. For example, the current MFN duty rate in the United States, as per the Harmonized Tariff Schedule (HTS) of the USITC, is 4.0% ad valorem. In the European Union (EU TARIC), the MFN duty rate is 5.3% ad valorem. The United Kingdom Global Tariff (UKGT) also lists a 5.3% ad valorem MFN rate. Importers should always verify the specific duty rate applicable to their destination country using the official tariff database for the most current information.
What are the key classification criteria for determining if a chemical compound falls under HS 2933.31?
The primary classification criterion for HS 2933.31 is the presence of an unfused pyridine ring in the chemical structure. This means the pyridine ring must not be fused with other heterocyclic or carbocyclic rings. The 'whether or not hydrogenated' clause indicates that the pyridine ring can be fully saturated (e.g., piperidine derivatives) or unsaturated. Compounds where the pyridine ring is fused with another ring system would typically be classified elsewhere, often in other subheadings of Chapter 2933 or Chapter 2934, depending on the nature of the fused system. Importers should provide a detailed chemical structure and CAS number to their customs broker or classification specialist to ensure accurate classification, referencing the Explanatory Notes to the Harmonized System for Chapter 29.
Are there any preferential duty rates available for HS 2933.31 under common free trade agreements (FTAs) or Generalized System of Preferences (GSP) schemes?
Yes, preferential duty rates, including 'Free' rates, are often available for HS 2933.31 under various Free Trade Agreements (FTAs) and Generalized System of Preferences (GSP) schemes, provided the goods meet the respective rules of origin. For instance, goods originating from countries with which the U.S. has an FTA (e.g., USMCA, CAFTA-DR, KORUS) may enter duty-free. Similarly, goods from GSP beneficiary countries may also qualify for duty-free entry into the U.S., EU, or UK, subject to GSP rules. For example, under the EU's GSP scheme, many developing countries can export products under HS 2933.31 to the EU duty-free. Importers must ensure they have valid Certificates of Origin (e.g., Form A for GSP, specific FTA certificates) to claim these preferential rates, as failure to provide proper documentation will result in the application of the MFN rate.
What specific documentation is typically required by customs authorities for the import of chemical compounds under HS 2933.31?
For the import of chemical compounds under HS 2933.31, customs authorities typically require standard import documentation, including a commercial invoice, packing list, and bill of lading or air waybill. Crucially, a detailed chemical description, including the Chemical Abstracts Service (CAS) number and chemical structure, should be provided on the commercial invoice or an accompanying technical data sheet to facilitate accurate classification. If claiming preferential duty rates, a valid Certificate of Origin (e.g., EUR.1, NAFTA/USMCA Certificate, GSP Form A) is mandatory. Additionally, depending on the specific compound and its end-use, regulatory documentation such as Safety Data Sheets (SDS), import permits (e.g., for controlled substances or precursors), or compliance with chemical registration schemes (e.g., REACH in the EU, TSCA in the U.S.) may be required by relevant government agencies.