Product classification
HS code for Pyridine: 2933.31
Heterocyclic compounds, containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts.
Classification of pyridine under HS 2933.31
Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one methine group replaced by a nitrogen atom. Under the Harmonized System, pyridine is classified within Chapter 29, which encompasses organic chemicals. Specifically, it falls under heading 2933, which is reserved for heterocyclic compounds containing nitrogen hetero-atom(s) only. Within this heading, the six-membered ring structure of pyridine, when unfused and regardless of whether it is hydrogenated, is categorized under subheading 2933.31. This classification is strictly for the compound pyridine itself and its salts. The determination of this code relies on the chemical purity and the specific molecular arrangement defined in the General Rules for the Interpretation of the Harmonized System (GRI), specifically GRI 1, which dictates that classification is determined by the terms of the headings and any relative section or chapter notes. Because pyridine is a chemically defined compound, it must meet specific purity standards to remain in Chapter 29; otherwise, it might be classified as a mixture or a crude oil derivative in Chapter 27.
- Covers
- Pure pyridine (C5H5N)
- Pyridine hydrochloride
- Pyridine sulfate
- Pyridine nitrate
- Pyridine quaternary salts
- Analytical grade pyridine reagents
- Also under 2933.31
- Pyridine from Merck
- Sigma-Aldrich pyridine
- specific industrial-grade pyridine from chemical suppliers
Codes often confused with 2933.31
Common mistake. Pyridine is frequently confused with its derivatives, which are classified under HS code 2933.39. While pyridine itself is 2933.31, substituted pyridines like picolines, lutidines, and more complex pharmaceutical intermediates fall under the 'other' category. Additionally, crude pyridine bases extracted from coal tar are often misclassified here but should actually be placed under HS code 2707.50 if they are not chemically pure. It is essential to verify the CAS number and purity level to distinguish between the pure chemical and industrial mixtures.
Top exporters and importers of HS 293331 (the code used for pyridine), 2025
In 2025, the largest exporter of HS 293331 (the code used for pyridine) in UN Comtrade data was India, with 62% of world exports; the largest importer in UN Comtrade data was the United Kingdom, with 23% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 293331, not only pyridine.
Top exporters 2025 · share of world exports
- 1 India $90M 62% of world exports
- 2 China $21M 14% of world exports
- 3 Russia* ~$7.4M 5.1% of world exports · partner records ↗
World total: $145M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United Kingdom $34M 23% of world imports
- 2 India $26M 18% of world imports
- 3 United States $17M 12% of world imports
World total: $146M 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 codes for pyridine
Brazil splits HS 2933.31 into 2 NCM codes. Pick the one that matches your product:
- 2933.31.10Pyridine
- 2933.31.20Pyridine salts
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about pyridine
What is the HS code for Pyridine?
The HS code for Pyridine is 293331 (Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts). The specific HS code for pyridine and its salts is 2933.31.
How do I classify Pyridine for customs?
Pyridine is classified under HS code 293331 — Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts. This is a 6-digit subheading level code.
Are pyridine derivatives like piperidine included in this code?
No, piperidine (hexahydropyridine) is classified under HS code 2933.32, as it is a specific hydrogenated version of the pyridine ring that has its own dedicated subheading.
Which countries are the top exporters of pyridine (HS 293331)?
In 2025, the top exporters of HS 293331 (the code used for pyridine) in UN Comtrade data were India ($90M, 62% of world exports), China ($21M) and Russia (about $7.4M). World exports came to about $145M, 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 pyridine (HS 293331)?
In 2025, the top importers of HS 293331 (the code used for pyridine) in UN Comtrade data were the United Kingdom ($34M, 23% of world imports), India ($26M) and the United States ($17M). World imports came to about $146M, 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.
Is the HS code for Pyridine the same in all countries?
The base HS code 293331 for Pyridine is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for pyridine in Brazil?
Brazil splits HS 293331 into 2 NCM codes, so the right one for pyridine depends on the product's details: 2933.31.10 (Pyridine), 2933.31.20 (Pyridine salts).