Isomethyltetrahydrophthalic anhydride

CAS 11070-44-3

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 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. 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 291720 · basket

EPA reports by year

2023: US production Confidential · 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

Country of origin for US imports, from Census customs data (2024).

CN 25%ChinaIT 21%ItalyJP 21%JapanDE 14%GermanyIN 9%India

Ukraine
South Africa
Malaysia
Netherlands
Mexico
United Kingdom
Switzerland
Latvia
Canada

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Marubeni America

EPA-registered importers (4)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Aalborz Chemical

Huntsman

Resonac America

Westlake

Why It Matters

Sectors

WaterElectronicsPlastics & Rubber

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 3 sectors as 3 functional roles.

•Surfactant (surface active agent) in Plastics Material and Resin ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Insulators in Electrical Equipment, Appliance, and Component ManufacturingProcessing—incorporation into article
•Intermediate in Utilities (100%)Processing—incorporation into article

Chemical Identity

CAS11070-44-3

PubChem CIDNot recorded

DTXSIDDTXSID0027729

FormulaNot recorded

Mol. WeightNot recorded

SMILESNot recorded

Data Sources

EPA CompTox (DSSTox) · DTXSID0027729Retrieved 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

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Brief citations

Isomethyltetrahydrophthalic anhydride (CAS 11070-44-3) https://chemicalindependence.com/chemical/11070-44-3/ EPA CompTox (DSSTox): DTXSID0027729. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0027729 EPA Chemical Data Reporting: 11070-44-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 11070-44-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291720 for CAS 11070-44-3. Reporting year: 2024. https://usatrade.census.gov/