Phthalic anhydride
CAS 85-44-9
U.S. production volumes are classified as confidential business information.
US productionCBI
Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.
Import value, 2024$37M
Top sourceSouth Korea 34%
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.
Where It Comes From
Customs basis: HS 291735 · exact
EPA reports by year
- 2023
- US production Confidential · Imports Confidential
- 2019
- US production Confidential · Imports Confidential
Source Countries
Country of origin for US imports, from Census customs data (2024).
KR 34%South KoreaMX 32%MexicoIL 17%IsraelAT 9%AustriaBR 5%Brazil
- Canada
- Taiwan
- India
- China
- United Kingdom
- Turkey
- Japan
EPA-registered manufacturers (3)
Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.
Hempel Usa
Koppers
Soyventis North America
Domestic parents -- activity not disclosed (10)
EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.
Allnex Usa
Aoc
Catalynt Solutions
Cellmark Basic Materials
Daxx
Show all 10
ExxonMobil
Icc Industries
Polynt Composites Usa
Posco International America
Stepan
EPA-registered importers (10)
Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.
Kh Chemicals International B V · NL Netherlands
Orbia Advance Corp S A B De C V · MX Mexico
Alphagary
Ambyth Chemical
Huntsman
Show all 10
Kh Chemicals Na
Lanxess
Panolam Industries International
Starchem Usa
The Chemical
Why It Matters
Sectors
WaterConstructionPlastics & RubberTextilesPaints & CoatingsPaper & PrintingCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."
No FDA shortage records
Industrial Uses
Used in 10 sectors as 11 functional roles.
- •Monomers in Plastics Material and Resin Manufacturing (100%)Processing as a reactant
- •Binder in Paint and Coating Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
- •Intermediate in Paint and Coating Manufacturing (0%)Processing as a reactant
- •Plasticizer in Paint and Coating ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
- •Solvent in Paint and Coating Manufacturing (0%)Processing—incorporation into formulation, mixture, or reaction product
- •Monomers in All Other Basic Organic Chemical ManufacturingProcessing as a reactant
- •Polymerization promoter in Synthetic Dye and Pigment Manufacturing (30%)Processing as a reactant
- •Pigment in Printing Ink Manufacturing (10%)Processing as a reactant
- •Plasticizer in Plastics Product Manufacturing (60%)Processing as a reactant
- •Intermediate in Plastics Material and Resin Manufacturing (100%)Processing as a reactant
- •Intermediate in Adhesive Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Hardener in Paint and Coating Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Intermediate in All Other Basic Inorganic Chemical Manufacturing (98%)Processing—incorporation into formulation, mixture, or reaction product
- •Solvent in Utilities (2%)Processing—incorporation into formulation, mixture, or reaction product
- •Filler in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
- •Flame retardant in Plastics Product Manufacturing (5%)Processing—incorporation into formulation, mixture, or reaction product
- •Dye in Synthetic Dye and Pigment Manufacturing (15%)Processing—incorporation into formulation, mixture, or reaction product
- •Plasticizer in Plastics Material and Resin Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
- •Intermediate in Plastics Product Manufacturing (40%)Processing—incorporation into formulation, mixture, or reaction product
- •Solvent in Plastics Material and Resin Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
Vendor Pricing
$0.03/gALFA AESAR
CountryGermany
Pack$126.00 / 5 kg
Purity99%
Vendors19 available
Prices reflect listed pack sizes. Small research packs run far above bulk rates.
18 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 |
|---|---|---|---|---|
| A2B Chem LLC | United States | $0.03 | 500 g | 99% |
| AA BLOCKS | United States | $0.03 | 500 g | 99% |
| Sigma-Aldrich (Rush Stock) | Germany | $0.05 | 2.5 kg | 99% |
| Sigma-Aldrich | Germany | $0.05 | 2.5 kg | 99% |
| AK Scientific Specialized | United States | $0.09 | 1 kg | 98% |
| AK Scientific, Inc. | United States | $0.11 | 1 kg | 99% |
| Apollo Scientific US | United Kingdom | $0.15 | 1 kg | 95% |
| Combi-Blocks, Inc. | United States | $0.25 | 1 kg | 98% |
| Fluorochem EU | Germany | $0.53 | 100 g | 99% |
| Fluorochem UK | United Kingdom | $0.54 | 100 g | 99% |
| Labotest KG | Germany | $217.80 | 5000 mg | 90% |
| Otava, Ltd. | Ukraine | $460.00 | 250 mg | 90% |
| Key Organics Ltd. | United Kingdom | $1960.00 | 100 mg | 95% |
| Otava, Ltd. (2 weeks) | Ukraine | $2724.00 | 50 mg | 90% |
| Princeton BioMolecular Research (SC) | United States | $2900.00 | 100 mg | 90% |
| Vitas M Chemical Limited | Hong Kong | $3170.00 | 100 mg | 90% |
| Asinex | Netherlands | $6461.40 | 100 mg | 90% |
| TimTec, LLC (back-ordered) | United States | $32000.00 | 15 mg | 94% |
Chemical Identity
CAS85-44-9
PubChem CID6811
DTXSIDDTXSID2021159
FormulaC8H4O3
Mol. Weight148.11 g/mol
SMILESC1=CC=C2C(=C1)C(=O)OC2=O
Data Sources
- EPA CompTox (DSSTox) · DTXSID2021159Retrieved 2026-04-06
- PubChem · compound 6811Retrieved 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
Phthalic anhydride (CAS 85-44-9) https://chemicalindependence.com/chemical/85-44-9/ EPA CompTox (DSSTox): DTXSID2021159. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2021159 PubChem: 6811. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6811 EPA Chemical Data Reporting: 85-44-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 85-44-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291735 for CAS 85-44-9. Reporting year: 2024. https://usatrade.census.gov/