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Isooctyl phenyl phosphite

CAS 26401-27-4

Phosphorous acid, isooctyl diphenyl ester

Molecular structure of 26401-27-4
US productionNot reported
Import value, 2024$23M
Top sourceSingapore 52%

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 292029 · basket

These shares come from HS customs code 292029, which covers 28 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
SG 52%SingaporeTW 12%TaiwanIT 9%ItalyGB 7%United KingdomES 7%Spain

Why It Matters

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

Chemical Identity

CAS26401-27-4
PubChem CIDNot recorded
DTXSIDDTXSID6027898
FormulaNot recorded
Mol. WeightNot recorded
SMILESNot recorded

Data Sources

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Brief citations

Isooctyl phenyl phosphite (CAS 26401-27-4) https://chemicalindependence.com/chemical/26401-27-4/ EPA TSCA Inventory: CAS 26401-27-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 292029 for CAS 26401-27-4. Reporting year: 2024. https://usatrade.census.gov/