Trimethyl orthophosphate

CAS 512-56-1

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

US productionZero

Import value, 2024$123M

Import volumeCBI

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

Top sourceChina 66%

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. 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

2023: US production Zero · Imports Confidential
2019: US production Zero · Imports 17.6K lb

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

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.

Allchem Industries Holding

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Vendor Pricing

$0.02/gAaron Chemicals LLC

CountryHong Kong

Pack$10.00 / 500 g

Purity99%

Vendors21 available

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

20 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.03	500 g	99%
AA BLOCKS	United States	$0.04	250 g	99%
A2B Chem LLC	United States	$0.04	250 g	99%
Fluorochem UK	United Kingdom	$0.06	500 g	99%
Ambeed, Inc.	United States	$0.07	1 kg	99.5%
Angene International Limited	United States	$0.12	250 g	99%
Sigma-Aldrich (Rush Stock)	Germany	$0.13	1 kg	97%
Sigma-Aldrich	Germany	$0.13	1 kg	97%
ALFA AESAR	Germany	$0.16	500 g	98%
AstaTech, Inc	United States	$0.19	100 g	99%
Fluorochem EU	Germany	$0.22	100 g	99%
AK Scientific Specialized	United States	$0.22	500 g	95%
Combi-Blocks, Inc.	United States	$0.25	1 kg	98%
AK Scientific, Inc.	United States	$0.29	500 g	99%
TargetMol Chemicals	China → United States	$15.00	2 g	98%
MedChemExpress MCE	Sweden	$15.00	5 g	98%
Labotest KG	Germany	$217.80	5000 mg	90%
Otava, Ltd.	Ukraine	$2280.00	50 mg	95%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	95%
Angene	China → Hong Kong	$4266.67	30 mg	99%

Chemical Identity

CAS512-56-1

PubChem CID10541

DTXSIDDTXSID1021403

FormulaC3H9O4P

Mol. Weight140.07 g/mol

SMILESCOP(=O)(OC)OC

Data Sources

EPA CompTox (DSSTox) · DTXSID1021403Retrieved 2026-04-06
PubChem · compound 10541Retrieved 2026-04-06
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

Trimethyl orthophosphate (CAS 512-56-1) https://chemicalindependence.com/chemical/512-56-1/ EPA CompTox (DSSTox): DTXSID1021403. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID1021403 PubChem: 10541. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/10541 EPA Chemical Data Reporting: 512-56-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 291990 for CAS 512-56-1. Reporting year: 2024. https://usatrade.census.gov/