Nonylphenolphosphite(3:1)

CAS 26523-78-4

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 (3)

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

Arlanxeo Usa

Dover Chemical

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.

Si Group

Soyventis North America

EPA-registered importers (3)

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

Government Of Abu Dhabi · AE United Arab Emirates

Mayzo

Nc Holdings Usa

Why It Matters

Sectors

ConstructionMetals & MiningPlastics & 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 7 sectors as 5 functional roles.

•Antioxidant in Synthetic Rubber Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Antioxidant in Adhesive Manufacturing (100%)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
•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
•Stabilizing agent in Plastics Material and Resin Manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
•Stabilizing agent in Rubber Product Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
•Antioxidant in Other (40%)Processing—repackaging
•Antioxidant in Plastics Product Manufacturing (70%)Processing—incorporation into article
•Filler in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.27/gAaron Chemicals LLC

CountryHong Kong

Pack$136.00 / 500 g

Purity95%

Vendors7 available

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

6 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.30	500 g	95%
A2B Chem LLC	United States	$0.38	500 g	98%
Combi-Blocks, Inc.	United States	$0.38	500 g	98%
AA BLOCKS	United States	$0.44	100 g	97%
AstaTech (2 weeks)	United States	$48.00	1 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS26523-78-4

PubChem CID76452

DTXSIDDTXSID8027903

FormulaC45H69O3P

Mol. Weight689 g/mol

SMILESCCCCCCCCCC1=CC=C(C=C1)OP(OC2=CC=C(C=C2)CCCCCCCCC)OC3=CC=C(C=C3)CCCCCCCCC

Data Sources

EPA CompTox (DSSTox) · DTXSID8027903Retrieved 2026-04-06
PubChem · compound 76452Retrieved 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

Nonylphenolphosphite(3:1) (CAS 26523-78-4) https://chemicalindependence.com/chemical/26523-78-4/ EPA CompTox (DSSTox): DTXSID8027903. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID8027903 PubChem: 76452. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/76452 EPA Chemical Data Reporting: 26523-78-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 26523-78-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292029 for CAS 26523-78-4. Reporting year: 2024. https://usatrade.census.gov/