Trimethoxymethylsilane

CAS 1185-55-3

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

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 Confidential
2019: US production Confidential · Imports Confidential

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 (3)

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

Kcc · KR South Korea

Dow Chemical

Mom Holding

Domestic parents -- activity not disclosed (2)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Mitsubishi Chemical America

Wacker Chemical Corporation - Headquarters

EPA-registered importers (3)

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

Ab Specialty Silicones

Brb North America

Wego Chemical Group

Why It Matters

Sectors

ElectronicsConstructionPaints & CoatingsCore 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 8 sectors as 6 functional roles.

•Sealant (barrier) in Construction (7%)Processing—incorporation into article
•Intermediate in All Other Basic Inorganic Chemical Manufacturing (87%)Processing as a reactant
•Adhesion/cohesion promoter in Electrical Equipment, Appliance, and Component Manufacturing (6%)Processing—incorporation into article
•Catalyst in Petrochemical ManufacturingProcessing—incorporation into formulation, mixture, or reaction product
•Surface modifier in ConstructionProcessing—incorporation into formulation, mixture, or reaction product
•Intermediate in Paint and Coating Manufacturing (2%)Processing as a reactant
•Intermediate in Electrical Equipment, Appliance, and Component Manufacturing (10%)Processing as a reactant
•Intermediate in Adhesive Manufacturing (70%)Processing as a reactant
•Monomers in Construction (50%)Processing—incorporation into formulation, mixture, or reaction product
•Monomers in Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing) (40%)Processing—incorporation into formulation, mixture, or reaction product
•Monomers in All Other Chemical Product and Preparation Manufacturing (10%)Processing—incorporation into formulation, mixture, or reaction product
•Adhesion/cohesion promoter in Paint and Coating Manufacturing (40%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.01/gAaron Chemicals LLC

CountryHong Kong

Pack$7.00 / 500 g

Purity98%

Vendors12 available

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

11 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.02	500 g	98%
Fluorochem UK	United Kingdom	$0.03	500 g	98%
Fluorochem EU	Germany	$0.03	500 g	98%
AstaTech, Inc	United States	$0.12	1 kg	95%
A2B Chem LLC	United States	$0.30	500 g	98%
Combi-Blocks, Inc.	United States	$0.30	500 g	98%
AA BLOCKS	United States	$0.35	500 g	98%
Ambeed, Inc.	United States	$0.41	100 g	98%
Angene International Limited	United States	$0.56	500 g	97%
Labotest KG	Germany	$453.00	1000 mg	90%
Angene	China → Hong Kong	$4266.67	30 mg	98%

Chemical Identity

CAS1185-55-3

PubChem CID14456

DTXSIDDTXSID3027370

FormulaC4H12O3Si

Mol. Weight136.22 g/mol

SMILESCO[Si](C)(OC)OC

Data Sources

EPA CompTox (DSSTox) · DTXSID3027370Retrieved 2026-04-06
PubChem · compound 14456Retrieved 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

Trimethoxymethylsilane (CAS 1185-55-3) https://chemicalindependence.com/chemical/1185-55-3/ EPA CompTox (DSSTox): DTXSID3027370. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3027370 PubChem: 14456. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/14456 EPA Chemical Data Reporting: 1185-55-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1185-55-3. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 1185-55-3. Reporting year: 2024. https://usatrade.census.gov/