Trisiloxane, 3-ethenyl-1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]-

CAS 5356-84-3

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.

Top sourceNo public record

At least one company claimed its 2019 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: 2019.

Where It Comes From

EPA reports by year

2019: US production Confidential · Imports Confidential

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.

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

$2.44/gA2B Chem LLC

CountryUnited States

Pack$61.00 / 25 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
Combi-Blocks, Inc.	United States	$2.50	100 g	98%
AA BLOCKS	United States	$2.72	25 g	98%
Aaron Chemicals LLC	Hong Kong	$2.84	100 g	98%
BLD Pharmatech Ltd.	China	$2.90	100 g	98%
Ambeed, Inc.	United States	$2.90	100 g	98%
Angene Chemical	China → Hong Kong	$3.22	500 g	95%
Fluorochem UK	United Kingdom	$4.58	5 g	98%
AstaTech (2 weeks)	United States	$10.28	25 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS5356-84-3

PubChem CID79316

DTXSIDDTXSID50884150

FormulaC11H30O3Si4

Mol. Weight322.69 g/mol

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

Data Sources

EPA CompTox (DSSTox) · DTXSID50884150Retrieved 2026-04-06
PubChem · compound 79316Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04

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Brief citations

Trisiloxane, 3-ethenyl-1,1,1,5,5,5-hexamethyl-3-[(trimethylsilyl)oxy]- (CAS 5356-84-3) https://chemicalindependence.com/chemical/5356-84-3/ EPA CompTox (DSSTox): DTXSID50884150. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID50884150 PubChem: 79316. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/79316 EPA Chemical Data Reporting: 5356-84-3. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 5356-84-3. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting