1H-Benzo[de]isoquinoline-1,3(2H)-dione
CAS 81-83-4
U.S. production volumes are classified as confidential business information.
At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.
Why supply is unknownProduction is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.
Where It Comes From
Customs basis: HS 292519 · basket
- 2023
- US production Confidential · Imports Confidential
- 2019
- US production Confidential · Imports Confidential
These shares come from HS customs code 292519, which covers 43 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.
- Australia
- Belgium
- Israel
- Switzerland
- Hungary
- Ukraine
- Slovakia
- Singapore
Why It Matters
Industrial Uses
- •Pigment in Synthetic Dye and Pigment Manufacturing (100%)Processing as a reactant
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 |
|---|---|---|---|---|
| Angene Chemical | China → Hong Kong | $0.48 | 250 g | 98% |
| Combi-Blocks, Inc. | United States | $0.50 | 500 g | 97% |
| A2B Chem LLC | United States | $0.54 | 100 g | 96% |
| BLD Pharmatech Co., Limited | United States | $0.58 | 500 g | 96% |
| BLD Pharmatech Ltd. | China | $0.58 | 500 g | 96% |
| Ambeed, Inc. | United States | $0.58 | 500 g | 96% |
| AA BLOCKS | United States | $0.60 | 100 g | 96% |
| BLD Pharmatech GmbH | Germany | $0.75 | 100 g | 96% |
| Fluorochem EU | Germany | $1.11 | 25 g | 97% |
| AK Scientific Specialized | United States | $1.33 | 100 g | 95% |
| AK Scientific, Inc. | United States | $1.86 | 100 g | 98% |
| Angene International Limited | United States | $2.40 | 100 g | 95% |
| ALFA AESAR | Germany | $3.02 | 50 g | 98% |
| Sigma-Aldrich (Rush Stock) | Germany | $3.08 | 10 g | 99% |
| Sigma-Aldrich | Germany | $3.08 | 10 g | 99% |
| AstaTech (2 weeks) | United States | $9.60 | 5 g | 98% |
| Interbioscreen | Hong Kong | $24.00 | 10 g | 95% |
| TargetMol Chemicals | China → United States | $325.00 | 200 mg | — |
| Labotest KG | Germany | $453.00 | 1000 mg | 90% |
| Key Organics Ltd. | United Kingdom | $740.00 | 100 mg | 95% |
| Maybridge, Ltd. | United Kingdom | $2414.30 | 100 mg | 90% |
| Otava, Ltd. | Ukraine | $2724.00 | 50 mg | 95% |
| Princeton BioMolecular Research (SC) | United States | $2900.00 | 100 mg | 90% |
| Vitas M Chemical Limited | Hong Kong | $3170.00 | 100 mg | 90% |
| Angene | China → Hong Kong | $4266.67 | 30 mg | 98% |
| TimTec, LLC (back-ordered) | United States | $32000.00 | 15 mg | 94% |
Chemical Identity
Data Sources
- EPA CompTox (DSSTox) · DTXSID0044731Retrieved 2026-04-06
- PubChem · compound 66491Retrieved 2026-04-06
- EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
- EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
- US Census international tradeReporting year: 2024 · Retrieved 2026-10-04
Brief citations
1H-Benzo[de]isoquinoline-1,3(2H)-dione (CAS 81-83-4) https://chemicalindependence.com/chemical/81-83-4/ EPA CompTox (DSSTox): DTXSID0044731. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0044731 PubChem: 66491. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/66491 EPA Chemical Data Reporting: 81-83-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 81-83-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292519 for CAS 81-83-4. Reporting year: 2024. https://usatrade.census.gov/