Phenylphosphinic acid

CAS 1779-48-2

Companies reported imports and no US production of this chemical to EPA for 2023.

US productionZero

Import value, 2024$598M

Import volume135.1K lb

Import dependency100%

Top sourceChina 89%

Production is reported production, not a complete census of factories. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Phenylphosphinic acid · US import value by year

2013: $0M · Peak 2022: $1.5B · 2024: $598M · 2025: $691M

Where It Comes From

Customs basis: HS 293149 · basket

EPA reports by year

2023: US production Zero · Imports 135.1K lb
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 293149, which covers 114 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 89%ChinaIN 4%IndiaCA 3%CanadaDE 2%GermanyAR 1%Argentina

United Kingdom
Italy
Mexico
Japan
Switzerland
Hong Kong
Ukraine
Finland
Sweden
Spain
Poland
Slovakia
Netherlands
Singapore
Taiwan
South Korea
Czech Republic

EPA-registered importers (1)

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

Special Materials

Why It Matters

Sectors

Metals & MiningPlastics & Rubber

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 2 functional roles.

•UV stabilizer in Organic Fiber ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Reducing agent in Miscellaneous Manufacturing (0%)Processing as a reactant

Chemical Identity

CAS1779-48-2

PubChem CID72903

DTXSIDDTXSID0027436

FormulaC6H7O2P

Mol. Weight142.09 g/mol

SMILESC1=CC=C(C=C1)P(O)O

Data Sources

EPA CompTox (DSSTox) · DTXSID0027436Retrieved 2026-04-06
PubChem · compound 72903Retrieved 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

Phenylphosphinic acid (CAS 1779-48-2) https://chemicalindependence.com/chemical/1779-48-2/ EPA CompTox (DSSTox): DTXSID0027436. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0027436 PubChem: 72903. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/72903 EPA Chemical Data Reporting: 1779-48-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1779-48-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293149 for CAS 1779-48-2. Reporting year: 2024. https://usatrade.census.gov/