Dichlorosilane

CAS 4109-96-0

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$154M

Top sourceGermany 55%

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 285390 · basket

EPA reports by year

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

These shares come from HS customs code 285390, which covers 46 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).

DE 55%GermanyCA 21%CanadaJP 6%JapanGB 4%United KingdomKR 3%South Korea

Spain
Taiwan
Netherlands
Philippines
Sweden
El Salvador
Singapore
Belgium
Brazil
Austria
Israel
Czech Republic
Slovakia
Dominican Republic
Guyana
Argentina
Hong Kong
Indonesia
Colombia

EPA-registered manufacturers (3)

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

Corning

High-Purity Silicon America

Rec Silicon

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.

Emd Holding

Why It Matters

Sectors

EnergyElectronicsMetals & 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 4 sectors as 2 functional roles.

•Intermediate in Primary Metal Manufacturing (100%)Processing as a reactant
•Intermediate in All Other Basic Inorganic Chemical Manufacturing (0%)Processing as a reactant
•Semiconductor and photovoltaic agent in Computer and Electronic Product Manufacturing (100%)Processing—incorporation into article
•Semiconductor and photovoltaic agent in Industrial Gas ManufacturingUse—non-incorporative activities

Chemical Identity

CAS4109-96-0

PubChem CID61330

DTXSIDDTXSID1052082

FormulaCl2H2Si

Mol. Weight101 g/mol

SMILES[SiH2](Cl)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID1052082Retrieved 2026-04-06
PubChem · compound 61330Retrieved 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

Dichlorosilane (CAS 4109-96-0) https://chemicalindependence.com/chemical/4109-96-0/ EPA CompTox (DSSTox): DTXSID1052082. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID1052082 PubChem: 61330. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/61330 EPA Chemical Data Reporting: 4109-96-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 4109-96-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 285390 for CAS 4109-96-0. Reporting year: 2024. https://usatrade.census.gov/