Triphenyl phosphite

CAS 101-02-0

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$23M

Top sourceSingapore 52%

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 292029 · basket

EPA reports by year

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

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

Country of origin for US imports, from Census customs data (2024).

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

Brunei
Poland

EPA-registered manufacturers (2)

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

Dover Chemical

Proviron

Domestic parents -- activity not disclosed (2)

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

Icc Industries

Si Group

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.

Aalborz Chemical

Galata Chemicals

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 5 sectors as 7 functional roles.

•Heat stabilizer in Plastics Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Stabilizing agent in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Antioxidant in Synthetic Rubber Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
•UV stabilizer in Synthetic Rubber Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
•Chemical reaction regulator in Plastics Material and Resin Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
•Chemical reaction regulator in Synthetic Rubber Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
•UV stabilizer in Plastics Material and Resin Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
•Antioxidant in Plastics Material and Resin Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in Plastics Material and Resin Manufacturing (70%)Processing—incorporation into formulation, mixture, or reaction product
•Adhesion/cohesion promoter in Plastics Material and Resin Manufacturing (30%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.03/gA2B Chem LLC

CountryUnited States

Pack$16.00 / 500 g

Purity95%

Vendors14 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

13 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.04	500 g	95%
ALFA AESAR	Germany	$0.06	2.5 kg	97%
Sigma-Aldrich (Rush Stock)	Germany	$0.13	3 kg	97%
Sigma-Aldrich	Germany	$0.13	3 kg	97%
MedKoo Biosciences, Inc	United States	$0.21	3 kg	98%
AK Scientific Specialized	United States	$0.22	500 g	95%
Combi-Blocks, Inc.	United States	$0.25	1 kg	97%
AK Scientific, Inc.	United States	$0.29	500 g	98%
Fluorochem UK	United Kingdom	$0.76	100 g	97%
Otava, Ltd.	Ukraine	$2280.00	50 mg	95%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	95%
Asinex	Netherlands	$6461.40	100 mg	90%
TimTec, LLC (back-ordered)	United States	$32000.00	15 mg	94%

Chemical Identity

CAS101-02-0

PubChem CID7540

DTXSIDDTXSID0026252

FormulaC18H15O3P

Mol. Weight310.3 g/mol

SMILESC1=CC=C(C=C1)OP(OC2=CC=CC=C2)OC3=CC=CC=C3

Data Sources

EPA CompTox (DSSTox) · DTXSID0026252Retrieved 2026-04-06
PubChem · compound 7540Retrieved 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

Triphenyl phosphite (CAS 101-02-0) https://chemicalindependence.com/chemical/101-02-0/ EPA CompTox (DSSTox): DTXSID0026252. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0026252 PubChem: 7540. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/7540 EPA Chemical Data Reporting: 101-02-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 101-02-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292029 for CAS 101-02-0. Reporting year: 2024. https://usatrade.census.gov/