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Monooctadecyl orthophosphate

CAS 2958-09-0

Phosphoric acid, monooctadecyl ester

Molecular structure of 2958-09-0
US productionNot reported
Import value, 2024$123M
Top sourceChina 66%

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 291990 · basket

These shares come from HS customs code 291990, which covers 77 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 66%ChinaDE 18%GermanyJP 5%JapanIN 3%IndiaCH 3%Switzerland

Why It Matters

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

Chemical Identity

CAS2958-09-0
PubChem CIDNot recorded
DTXSIDDTXSID20880482
FormulaC18H39O4P
Mol. Weight350.48 g/mol
SMILESCCCCCCCCCCCCCCCCCCOP(O)(O)=O

Data Sources

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Brief citations

Monooctadecyl orthophosphate (CAS 2958-09-0) https://chemicalindependence.com/chemical/2958-09-0/ EPA TSCA Inventory: CAS 2958-09-0. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 291990 for CAS 2958-09-0. Reporting year: 2024. https://usatrade.census.gov/