Phosphine

CAS 7803-51-2

U.S. production volumes are classified as confidential business information.

H₃P34.0 g/mol

no molecular structure to draw

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$154M

Top sourceGermany 55%

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 285390 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 285390, which covers 46 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).

DE 55%GermanyCA 21%CanadaJP 6%JapanGB 4%United KingdomKR 3%South Korea

Spain
Taiwan
Netherlands
Philippines
Sweden
El Salvador
Singapore
Belgium
Brazil
Austria
Israel
Czech Republic
Slovakia
Dominican Republic
Guyana
Argentina
Hong Kong
Indonesia
Colombia

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Emd Holding

EPA-registered importers (2)

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

Syensqo Sa · BE Belgium

Solvay

Why It Matters

Sectors

EnergyElectronics

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.

•Intermediate in Computer and Electronic Product Manufacturing (100%)Processing—incorporation into article
•Semiconductor and photovoltaic agent in Industrial Gas ManufacturingUse—non-incorporative activities

Chemical Identity

CAS7803-51-2

PubChem CID24404

DTXSIDDTXSID2021157

FormulaH3P

Mol. Weight33.998 g/mol

SMILESP

Data Sources

EPA CompTox (DSSTox) · DTXSID2021157Retrieved 2026-04-06
PubChem · compound 24404Retrieved 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

Phosphine (CAS 7803-51-2) https://chemicalindependence.com/chemical/7803-51-2/ EPA CompTox (DSSTox): DTXSID2021157. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID2021157 PubChem: 24404. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/24404 EPA Chemical Data Reporting: 7803-51-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 7803-51-2. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 285390 for CAS 7803-51-2. Reporting year: 2024. https://usatrade.census.gov/