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Diisodecylphenyl phosphite

CAS 25550-98-5

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

Molecular structure of 25550-98-5
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 (2)
Dover Chemical
Proviron
Domestic parents -- activity not disclosed (3)
Baerlocher Usa
Mitsubishi International Polymertrade
Si Group
EPA-registered importers (1)
Galata Chemicals

Why It Matters

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

Industrial Uses

Used in 4 sectors as 6 functional roles.

  • •Heat stabilizer in Plastics Product 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
  • •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
  • •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
  • •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

$0.17/gA2B Chem LLC (2 weeks)
CountryUnited States
Pack$415.00 / 2.5 kg
PurityNot recorded
Vendors4 available

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

3 more vendors
VendorCountry$/gPackPurity
Angene ChemicalChina → Hong Kong$0.17500 g98%
AA BLOCKS (2 weeks)United States$0.172.5 kg—
Aaron Chemicals LLCHong Kong$0.32500 g—

Chemical Identity

CAS25550-98-5
PubChem CID16212880
DTXSIDDTXSID3027877
FormulaC26H47O3P
Mol. Weight438.6 g/mol
SMILESCC(C)CCCCCCCOP(OCCCCCCCC(C)C)OC1=CC=CC=C1

Data Sources

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Brief citations

Diisodecylphenyl phosphite (CAS 25550-98-5) https://chemicalindependence.com/chemical/25550-98-5/ EPA CompTox (DSSTox): DTXSID3027877. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3027877 PubChem: 16212880. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/16212880 EPA Chemical Data Reporting: 25550-98-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 25550-98-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292029 for CAS 25550-98-5. Reporting year: 2024. https://usatrade.census.gov/