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Cerium oxalate (Ce2(C2O4)3)

CAS 139-42-4

Cerium, [μ-[ethanedioato(2-)-κO1,κO2':κO1',κO2]]bis[ethanedioato(2-)-κO1,κO2]di-

Molecular structure of 139-42-4
US productionNot reported
Import value, 2024$19M
Top sourceJapan 73%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 284610 · basket

These shares come from HS customs code 284610, which covers 9 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
JP 73%JapanCN 17%ChinaAT 5%AustriaMY 2%MalaysiaEE 2%Estonia

Why It Matters

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

Chemical Identity

CAS139-42-4
PubChem CIDNot recorded
DTXSIDDTXSID501014574
FormulaC6Ce2O12
Mol. Weight544.286 g/mol
SMILESO=C(O[Ce]1OC(=O)C(=O)O1)C(=O)O[Ce]1OC(=O)C(=O)O1

Data Sources

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Brief citations

Cerium oxalate (Ce2(C2O4)3) (CAS 139-42-4) https://chemicalindependence.com/chemical/139-42-4/ EPA TSCA Inventory: CAS 139-42-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 284610 for CAS 139-42-4. Reporting year: 2024. https://usatrade.census.gov/