Triphenylphosphine

CAS 603-35-0

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

US productionCBI

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

Import value, 2024$598M

Top sourceChina 89%

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 293149 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
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 (11)

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

Arlanxeo Holding Bv · NL Netherlands

Basf Se · DE Germany

Novasol North America · CA Canada

Aceto Us

American River Brokerage

Show all 11

Arlanxeo Usa Llc-Hq

Basf

Covestro

Olin

Oq Chemicals

Shin Etsu Silicones Of America

Why It Matters

Sectors

Plastics & RubberCore Chemicals

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 4 sectors as 5 functional roles.

•Catalyst in Synthetic Rubber Manufacturing (100%)Processing as a reactant
•Intermediate in All Other Chemical Product and Preparation Manufacturing (100%)Processing as a reactant
•Stabilizing agent in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into article
•Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant
•Catalyst in All Other Basic Organic Chemical ManufacturingUse—non-incorporative activities
•Plasticizer in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Binder in Synthetic Rubber Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS603-35-0

PubChem CID11776

DTXSIDDTXSID5026251

FormulaC18H15P

Mol. Weight262.3 g/mol

SMILESC1=CC=C(C=C1)P(C2=CC=CC=C2)C3=CC=CC=C3

Data Sources

EPA CompTox (DSSTox) · DTXSID5026251Retrieved 2026-04-06
PubChem · compound 11776Retrieved 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

Triphenylphosphine (CAS 603-35-0) https://chemicalindependence.com/chemical/603-35-0/ EPA CompTox (DSSTox): DTXSID5026251. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5026251 PubChem: 11776. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/11776 EPA Chemical Data Reporting: 603-35-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 603-35-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293149 for CAS 603-35-0. Reporting year: 2024. https://usatrade.census.gov/