Pyridine-sulfur trioxide (1:1)
CAS 26412-87-3
Pyridine, compd. with sulfur trioxide (1:1)
This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.
Why supply is unknownProduction is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.
Where It Comes From
Customs basis: HS 294200 · basket
These shares come from HS customs code 294200, which covers 18 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Turkey
- Australia
- Ireland
- Czech Republic
- Ukraine
- Brazil
- Portugal
- Hungary
- Israel
- Russia
- Hong Kong
- Mexico
- South Africa
- Bulgaria
- Singapore
- Poland
- Malaysia
- Armenia
Why It Matters
No EPA sector or FDA product records name a use for this chemical.
Vendor Pricing
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
16 more vendors
| Vendor | Country Supplier country. Where available, shows shipping origin. When the supplier ships from a different country than where they are registered, both are shown. Most suppliers show registration country only. | $/g | Pack | Purity |
|---|---|---|---|---|
| Angene Chemical | China → Hong Kong | $0.04 | 500 g | 98% |
| Fluorochem UK | United Kingdom | $0.07 | 5 kg | 97% |
| A2B Chem LLC | United States | $0.08 | 1 kg | 97% |
| AA BLOCKS | United States | $0.09 | 500 g | 97% |
| Chemscene | United States | $0.11 | 1 kg | — |
| MedChemExpress MCE | Sweden | $0.14 | 1 kg | — |
| Fluorochem EU | Germany | $0.24 | 500 g | 97% |
| Manchester Organics | United Kingdom | $0.27 | 500 g | 98% |
| Apollo Scientific UK | United Kingdom | $0.27 | 500 g | 95% |
| AK Scientific Specialized | United States | $0.33 | 500 g | 95% |
| AK Scientific, Inc. | United States | $0.40 | 1 kg | 98% |
| AstaTech, Inc | United States | $0.59 | 100 g | 95% |
| Sigma-Aldrich (Rush Stock) | Germany | $1.12 | 100 g | 97% |
| Sigma-Aldrich | Germany | $1.12 | 100 g | 97% |
| Angene International Limited | United States | $1.62 | 100 g | 95% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 98% |
Chemical Identity
Data Sources
- EPA TSCA InventoryRetrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
Pyridine-sulfur trioxide (1:1) (CAS 26412-87-3) https://chemicalindependence.com/chemical/26412-87-3/ EPA TSCA Inventory: CAS 26412-87-3. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 294200 for CAS 26412-87-3. Reporting year: 2024. https://usatrade.census.gov/