Squaric acid
CAS 2892-51-5
3-Cyclobutene-1,2-dione, 3,4-dihydroxy-
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 291440 · basket
These shares come from HS customs code 291440, which covers 35 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Switzerland
- Hong Kong
- Japan
- India
- Canada
- Israel
- United Kingdom
- Netherlands
- Spain
- Ukraine
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.
26 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 |
|---|---|---|---|---|
| AA BLOCKS | United States | $0.64 | 100 g | 98% |
| Combi-Blocks, Inc. | United States | $0.78 | 1 kg | 97% |
| Chemscene | United States | $0.90 | 1 kg | — |
| BLD Pharmatech Co., Limited | United States | $0.92 | 1 kg | 98% |
| BLD Pharmatech GmbH | Germany | $0.92 | 1 kg | 98% |
| BLD Pharmatech Ltd. | China | $0.92 | 1 kg | 98% |
| Ambeed, Inc. | United States | $0.92 | 1 kg | 98% |
| AstaTech, Inc | United States | $0.94 | 50 g | 97% |
| Fluorochem EU | Germany | $1.11 | 25 g | 98% |
| MedChemExpress MCE | Sweden | $1.12 | 1 kg | — |
| Fluorochem UK | United Kingdom | $1.13 | 100 g | 98% |
| Aaron Chemicals LLC | Hong Kong | $1.15 | 100 g | 98% |
| AK Scientific Specialized | United States | $1.20 | 100 g | 95% |
| Angene Chemical | China → Hong Kong | $1.26 | 100 g | 98% |
| AK Scientific, Inc. | United States | $1.65 | 100 g | 98% |
| Angene International Limited | United States | $2.89 | 100 g | 98% |
| Key Organics Ltd. | United Kingdom | $8.10 | 10 g | 95% |
| Sigma-Aldrich (Rush Stock) | Germany | $11.76 | 100 g | 99% |
| Sigma-Aldrich | Germany | $11.76 | 100 g | 99% |
| ChemDiv, Inc. | United States | $18.00 | 50 g | 90% |
| ALFA AESAR | Germany | $27.24 | 1 g | 98% |
| Interbioscreen | Hong Kong | $75.00 | 10 g | 95% |
| Labotest KG | Germany | $217.80 | 5000 mg | 90% |
| Otava, Ltd. (2 weeks) | Ukraine | $2724.00 | 50 mg | 90% |
| Life Chemicals Inc. | Ukraine → Canada | $3100.00 | 100 mg | 90% |
| 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
Squaric acid (CAS 2892-51-5) https://chemicalindependence.com/chemical/2892-51-5/ EPA TSCA Inventory: CAS 2892-51-5. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 291440 for CAS 2892-51-5. Reporting year: 2024. https://usatrade.census.gov/