Triisotridecyl phosphite

CAS 77745-66-5

Phosphorous acid, triisotridecyl ester

Companies reported imports and no US production of this chemical to EPA for 2023.

US productionZero

Import value, 2024$23M

Import volume39.7K lb

Import dependency100%

Top sourceSingapore 52%

Production is reported production, not a complete census of factories. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Triisotridecyl phosphite · US import value by year

2013: $0M · 2024: $23M · Peak 2025: $47M

Where It Comes From

Customs basis: HS 292029 · basket

EPA reports by year

2023: US production Zero · Imports 39.7K lb

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

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.

Mitsubishi International Polymertrade

Mohawk Industries

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.

Mitsubishi Corporation (Americas)

Why It Matters

Sectors

Plastics & 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

•Stabilizing agent in Plastics Product Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS77745-66-5

PubChem CIDNot recorded

DTXSIDDTXSID20228365

FormulaC39H81O3P

Mol. Weight629.048 g/mol

SMILESCC(C)CCCCCCCCCCOP(OCCCCCCCCCCC(C)C)OCCCCCCCCCCC(C)C

Data Sources

EPA TSCA InventoryRetrieved 2026-04-29
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

Triisotridecyl phosphite (CAS 77745-66-5) https://chemicalindependence.com/chemical/77745-66-5/ EPA TSCA Inventory: CAS 77745-66-5. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 77745-66-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 77745-66-5. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292029 for CAS 77745-66-5. Reporting year: 2024. https://usatrade.census.gov/