Trimethyl borate

CAS 121-43-7

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$208M

Top sourceChina 28%

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 292090 · basket

EPA reports by year

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

These shares come from HS customs code 292090, which covers 98 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 28%ChinaKR 17%South KoreaIT 13%ItalyIN 10%IndiaDE 9%Germany

Poland
Switzerland
Ireland
Canada
Lithuania
Netherlands
Brazil
Malaysia
Hungary
Czech Republic
Saudi Arabia
Slovakia
Ukraine
Turkey

EPA-registered manufacturers (1)

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

Ascensus Specialties

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.

Cellmark Usa

Why It Matters

Sectors

HealthMetals & MiningCore 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 2 sectors as 2 functional roles.

•Intermediate in Pharmaceutical and Medicine ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Reducing agent in Miscellaneous ManufacturingProcessing as a reactant

Vendor Pricing

$0.18/gA2B Chem LLC

CountryUnited States

Pack$89.00 / 500 g

Purity95%

Vendors5 available

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

4 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.20	500 g	95%
Combi-Blocks, Inc.	United States	$0.25	1 kg	95%
Manchester Organics	United Kingdom	$1.69	25 g	98%
AstaTech, Inc	United States	$4.80	25 g	95%

Chemical Identity

CAS121-43-7

PubChem CID8470

DTXSIDDTXSID0037738

FormulaC3H9BO3

Mol. Weight103.92 g/mol

SMILESB(OC)(OC)OC

Data Sources

EPA CompTox (DSSTox) · DTXSID0037738Retrieved 2026-04-06
PubChem · compound 8470Retrieved 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

Trimethyl borate (CAS 121-43-7) https://chemicalindependence.com/chemical/121-43-7/ EPA CompTox (DSSTox): DTXSID0037738. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID0037738 PubChem: 8470. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8470 EPA Chemical Data Reporting: 121-43-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 121-43-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292090 for CAS 121-43-7. Reporting year: 2024. https://usatrade.census.gov/