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Tetrahydrophthalic anhydride

CAS 85-43-8

Used in 3 industrial sectors tracked by the EPA.

Molecular structure of 85-43-8
US production19.9M lb
Import value, 2024$37M
Import volumeCBI
Top sourceChina 25%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. 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 291720 · basket

EPA reports by year
2023
US production 19.9M lb · Imports Confidential
2019
US production Confidential · Imports Confidential

These shares come from HS customs code 291720, which covers 42 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 25%ChinaIT 21%ItalyJP 21%JapanDE 14%GermanyIN 9%India
EPA-registered manufacturers (2)
Dixie Chemical
Lindau Chemicals
Domestic parents -- activity not disclosed (2)
Polynt Composites Usa
Soyventis North America
EPA-registered importers (4)
Brenntag
Catalynt Solutions
Huntsman
Wego Chemical Group

Why It Matters

Sectors
WaterPlastics & RubberCore Chemicals
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 4 sectors as 6 functional roles.

  • •Monomers in Plastics Material and Resin Manufacturing (100%)Processing as a reactant
  • •Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
  • •Hardener in Plastics Material and Resin Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
  • •Chelating agent in Plastics Material and Resin Manufacturing (5%)Processing—incorporation into formulation, mixture, or reaction product
  • •pH regulating agent in Plastics Material and Resin Manufacturing (5%)Processing—incorporation into formulation, mixture, or reaction product
  • •Intermediate in Utilities (100%)Processing—incorporation into article
  • •Filler in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.31/gAstaTech, Inc
CountryUnited States
Pack$157.00 / 500 g
Purity98%
Vendors9 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

8 more vendors
VendorCountry$/gPackPurity
ChemsceneUnited States$0.31500 g—
AK Scientific, Inc.United States$0.57100 g98%
Combi-Blocks, Inc.United States$0.76500 g98%
Fluorochem EUGermany$7.261 g95%
InterbioscreenHong Kong$10.0010 g95%
SpecsNetherlands$132.1310 g90%
Labotest KGGermany$217.805000 mg90%
Otava, Ltd.Ukraine$460.00250 mg95%

Chemical Identity

CAS85-43-8
PubChem CID6810
DTXSIDDTXSID3026516
FormulaC8H8O3
Mol. Weight152.15 g/mol
SMILESC1C=CCC2C1C(=O)OC2=O

Data Sources

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Brief citations

Tetrahydrophthalic anhydride (CAS 85-43-8) https://chemicalindependence.com/chemical/85-43-8/ EPA CompTox (DSSTox): DTXSID3026516. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3026516 PubChem: 6810. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6810 EPA Chemical Data Reporting: 85-43-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 85-43-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291720 for CAS 85-43-8. Reporting year: 2024. https://usatrade.census.gov/