Diethyl phosphite

CAS 762-04-9

EPA’s 2023 records show zero U.S. production of this chemical.

US productionZero

Import value, 2024$931K

Import volumeCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceChina 76%

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. Production reporting year: 2023.

Where It Comes From

Customs basis: HS 292022 · exact

EPA reports by year

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

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 76%ChinaIN 24%India

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Icl Specialty Products North America

Why It Matters

Sectors

Core 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

•Intermediate in All Other Basic Organic Chemical Manufacturing (100%)Processing as a reactant

Chemical Identity

CAS762-04-9

PubChem CID6327654

DTXSIDDTXSID9041861

FormulaC4H10O3P+

Mol. Weight137.09 g/mol

SMILESCCO[P+](=O)OCC

Data Sources

EPA CompTox (DSSTox) · DTXSID9041861Retrieved 2026-04-06
PubChem · compound 6327654Retrieved 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

Diethyl phosphite (CAS 762-04-9) https://chemicalindependence.com/chemical/762-04-9/ EPA CompTox (DSSTox): DTXSID9041861. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID9041861 PubChem: 6327654. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6327654 EPA Chemical Data Reporting: 762-04-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 762-04-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292022 for CAS 762-04-9. Reporting year: 2024. https://usatrade.census.gov/