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Diphenyl phosphite

CAS 4712-55-4

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

Molecular structure of 4712-55-4
US productionCBI
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
SG 52%SingaporeTW 12%TaiwanIT 9%ItalyGB 7%United KingdomES 7%Spain
EPA-registered manufacturers (1)
Dover Chemical
Domestic parents -- activity not disclosed (1)
Si Group

Why It Matters

Sectors
Plastics & Rubber
Downstream UsesNot recorded
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 2 sectors as 3 functional roles.

  • •UV stabilizer in Synthetic Rubber Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
  • •Antioxidant in Plastics Material and Resin Manufacturing (90%)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 Plastics Material and Resin Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
  • •Stabilizing agent in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.04/gAngene Chemical
CountryChina (registered: Hong Kong)
Pack$19.00 / 500 g
Purity80%
Vendors13 available

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

12 more vendors
VendorCountry$/gPackPurity
A2B Chem LLCUnited States$0.053 kg80%
AA BLOCKSUnited States$0.063 kg80%
ChemsceneUnited States$0.101 kg—
Fluorochem UKUnited Kingdom$0.121 kg80%
Fluorochem EUGermany$0.15100 g80%
Sigma-Aldrich (Rush Stock)Germany$0.22500 g—
Sigma-AldrichGermany$0.22500 g—
Combi-Blocks, Inc.United States$0.251 kg85%
Ambeed, Inc.United States$0.50100 g75%
Angene International LimitedUnited States$0.83100 g75%
AstaTech, IncUnited States$0.99100 g95%
AngeneChina → Hong Kong$4266.6730 mg80%

Chemical Identity

CAS4712-55-4
PubChem CID62550
DTXSIDDTXSID7041889
FormulaC12H11O3P
Mol. Weight234.19 g/mol
SMILESC1=CC=C(C=C1)OP(=O)OC2=CC=CC=C2

Data Sources

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Brief citations

Diphenyl phosphite (CAS 4712-55-4) https://chemicalindependence.com/chemical/4712-55-4/ EPA CompTox (DSSTox): DTXSID7041889. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7041889 PubChem: 62550. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/62550 EPA Chemical Data Reporting: 4712-55-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 4712-55-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292029 for CAS 4712-55-4. Reporting year: 2024. https://usatrade.census.gov/