Monooctyl phosphate

CAS 3991-73-9

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$123M

Top sourceChina 66%

At least one company claimed its 2019 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: 2019. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 291990 · basket

EPA reports by year

2019: US production Confidential · Imports Confidential

These shares come from HS customs code 291990, which covers 77 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).

CN 66%ChinaDE 18%GermanyJP 5%JapanIN 3%IndiaCH 3%Switzerland

Poland
Canada
Taiwan
Belgium
Netherlands
Malaysia
Austria
Spain
Ireland
Mexico
South Korea
Turkey
Czech Republic
Hong Kong

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 ManufacturingProcessing as a reactant

Vendor Pricing

$2708.00/gAstaTech, Inc

CountryUnited States

Pack$677.00 / 250 mg

Purity95%

Vendors4 available

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

3 more vendors

Vendor	Country	$/g	Pack	Purity
A2B Chem LLC	United States	$2808.00	250 mg	95%
AA BLOCKS	United States	$3112.00	250 mg	95%
Angene International Limited	United States	$4436.00	250 mg	95%

Chemical Identity

CAS3991-73-9

PubChem CID19892

DTXSIDDTXSID4058605

FormulaC8H19O4P

Mol. Weight210.21 g/mol

SMILESCCCCCCCCOP(=O)(O)O

Data Sources

EPA CompTox (DSSTox) · DTXSID4058605Retrieved 2026-04-06
PubChem · compound 19892Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Monooctyl phosphate (CAS 3991-73-9) https://chemicalindependence.com/chemical/3991-73-9/ EPA CompTox (DSSTox): DTXSID4058605. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID4058605 PubChem: 19892. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/19892 EPA Chemical Data Reporting: 3991-73-9. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 3991-73-9. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291990 for CAS 3991-73-9. Reporting year: 2024. https://usatrade.census.gov/