Ethyl silicon trichloride

CAS 115-21-9

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$537M

Import volumeZero

Top sourceChina 39%

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 293190 · basket

EPA reports by year

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

These shares come from HS customs code 293190, which covers 378 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 39%ChinaDE 17%GermanyIT 9%ItalyIN 7%IndiaJP 7%Japan

Ireland
Netherlands
Switzerland
Monaco
Ukraine
Spain
Mexico
Poland
Indonesia
Armenia
Israel
Sweden
Australia
Czech Republic
Hungary
Brunei
Hong Kong
Brazil
Thailand
Argentina
Finland
Austria
Latvia

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.

Dow Chemical

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 Inorganic Chemical Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.84/gA2B Chem LLC

CountryUnited States

Pack$21.00 / 25 g

Purity98%

Vendors2 available

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

1 more vendor

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.92	25 g	98%

Chemical Identity

CAS115-21-9

PubChem CID8260

DTXSIDDTXSID7026940

FormulaC2H5Cl3Si

Mol. Weight163.5 g/mol

SMILESCC[Si](Cl)(Cl)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID7026940Retrieved 2026-04-06
PubChem · compound 8260Retrieved 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

Ethyl silicon trichloride (CAS 115-21-9) https://chemicalindependence.com/chemical/115-21-9/ EPA CompTox (DSSTox): DTXSID7026940. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7026940 PubChem: 8260. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/8260 EPA Chemical Data Reporting: 115-21-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 115-21-9. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 115-21-9. Reporting year: 2024. https://usatrade.census.gov/