Diethyl maleate

CAS 141-05-9

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$139M

Top sourceChina 67%

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 291719 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 291719, which covers 176 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 67%ChinaCA 13%CanadaAT 4%AustriaIN 4%IndiaJP 4%Japan

Taiwan
Netherlands
Switzerland
Mexico
South Africa
Denmark
Malaysia
Ukraine
Colombia
Hong Kong
Slovakia

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.

Solvay

EPA-registered importers (3)

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

Textile Rubber & Chemical

Van Horn, Metz &

Wego Chemical Group

Why It Matters

Sectors

Metals & MiningPaints & Coatings

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 2 sectors as 1 functional role.

•Plasticizer in Mining (except Oil and Gas) and support activities (100%)Processing as a reactant
•Plasticizer in Paint and Coating ManufacturingProcessing as a reactant

Vendor Pricing

$0.02/gAaron Chemicals LLC

CountryHong Kong

Pack$8.00 / 500 g

Purity98%

Vendors2 available

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

1 more vendor

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.03	500 g	95%

Chemical Identity

CAS141-05-9

PubChem CID5271566

DTXSIDDTXSID8020464

FormulaC8H12O4

Mol. Weight172.18 g/mol

SMILESCCOC(=O)C=CC(=O)OCC

Data Sources

EPA CompTox (DSSTox) · DTXSID8020464Retrieved 2026-04-06
PubChem · compound 5271566Retrieved 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

Diethyl maleate (CAS 141-05-9) https://chemicalindependence.com/chemical/141-05-9/ EPA CompTox (DSSTox): DTXSID8020464. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID8020464 PubChem: 5271566. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/5271566 EPA Chemical Data Reporting: 141-05-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 141-05-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291719 for CAS 141-05-9. Reporting year: 2024. https://usatrade.census.gov/