Phenol, 2-(1,1-dimethylethyl)-6-methyl-4-[3-[[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]propyl]-

CAS 203255-81-6

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.

Top sourceNo public record

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.

Where It Comes From

EPA reports by year

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

EPA-registered importers (1)

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

Dow Chemical

Why It Matters

Sectors

Metals & MiningPlastics & Rubber

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 3 sectors as 1 functional role.

•Antioxidant in Plastics Material and Resin Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Antioxidant in Other (10%)Processing—repackaging
•Antioxidant in Plastics Product Manufacturing (100%)Processing—incorporation into article

Chemical Identity

CAS203255-81-6

PubChem CID6850823

DTXSIDDTXSID60870221

FormulaC42H61O4P

Mol. Weight660.9 g/mol

SMILESCC1=CC(=CC(=C1O)C(C)(C)C)CCCOP2OC3=C(C=C(C=C3C(C)(C)C)C(C)(C)C)C4=C(O2)C(=CC(=C4)C(C)(C)C)C(C)(C)C

Data Sources

EPA CompTox (DSSTox) · DTXSID60870221Retrieved 2026-04-06
PubChem · compound 6850823Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

Phenol, 2-(1,1-dimethylethyl)-6-methyl-4-[3-[[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]propyl]- (CAS 203255-81-6) https://chemicalindependence.com/chemical/203255-81-6/ EPA CompTox (DSSTox): DTXSID60870221. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID60870221 PubChem: 6850823. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6850823 EPA Chemical Data Reporting: 203255-81-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 203255-81-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting