Ethyl maleate

CAS 3990-03-2

2-Butenedioic acid (2Z)-, 1-ethyl ester

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

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

EPA-registered manufacturers (1)

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

Aurorium

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Vendor Pricing

$0.33/gAaron Chemicals LLC

CountryHong Kong

Pack$163.00 / 500 g

Purity95%

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	$0.50	500 g	95%

Chemical Identity

CAS3990-03-2

PubChem CIDNot recorded

DTXSIDDTXSID60892145

FormulaC6H8O4

Mol. Weight144.126 g/mol

SMILESCCOC(=O)\C=C/C(O)=O

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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

Ethyl maleate (CAS 3990-03-2) https://chemicalindependence.com/chemical/3990-03-2/ EPA TSCA Inventory: CAS 3990-03-2. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 3990-03-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291719 for CAS 3990-03-2. Reporting year: 2024. https://usatrade.census.gov/