Methyltris(trimethylsiloxy)silane

CAS 17928-28-8

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 Zero · Imports 550.0K lb

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

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.

Milliken &

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.

Shin Etsu Silicones Of America

Why It Matters

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

Vendor Pricing

$0.58/gAaron Chemicals LLC

CountryHong Kong

Pack$58.00 / 100 g

Purity98%

Vendors10 available

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

9 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$0.63	100 g	98%
A2B Chem LLC	United States	$0.97	100 g	97%
AA BLOCKS	United States	$1.25	100 g	97%
Ambeed, Inc.	United States	$1.32	100 g	97%
Combi-Blocks, Inc.	United States	$1.36	500 g	98%
AK Scientific, Inc.	United States	$3.16	25 g	98%
Angene International Limited	United States	$6.28	25 g	98%
Fluorochem EU	Germany	$26.62	1 g	98%
Angene	China → Hong Kong	$4266.67	30 mg	98%

Chemical Identity

CAS17928-28-8

PubChem CID28838

DTXSIDDTXSID9025669

FormulaC10H30O3Si4

Mol. Weight310.68 g/mol

SMILESC[Si](C)(C)O[Si](C)(O[Si](C)(C)C)O[Si](C)(C)C

Data Sources

EPA CompTox (DSSTox) · DTXSID9025669Retrieved 2026-04-06
PubChem · compound 28838Retrieved 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

Methyltris(trimethylsiloxy)silane (CAS 17928-28-8) https://chemicalindependence.com/chemical/17928-28-8/ EPA CompTox (DSSTox): DTXSID9025669. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID9025669 PubChem: 28838. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/28838 EPA Chemical Data Reporting: 17928-28-8. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 293190 for CAS 17928-28-8. Reporting year: 2024. https://usatrade.census.gov/