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Octakis(trimethylsiloxy)silsesquioxane

Also known as: Octakis(trimethylsiloxy)silsesquioxane, Octakis[(trimethylsilyl)oxy]-pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, Pentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, 1,3,5,7,9,11,13,15-octakis[(trimethylsilyl)oxy]-, Q8M8, octakis(trimethylsiloxy)-t8-silsesquioxane

Octakis(trimethylsiloxy)silsesquioxane (CAS 51777-38-9) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C24H72O10Si11 and a molecular weight of 829.76300 g/mol. Key property: a density of 1.11. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
51777-38-9
Jingsj CID
J-18450-8
Molecular Formula
C24H72O10Si11
Molecular Weight
829.76300 g/mol
Category
Aliphatic Hydrocarbons
Last updated
8/21/2026
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Physicochemical Properties

Density1.11
Exact Mass828.25900
PSA92.30000
LogP9.13840

Frequently Asked Questions

What is the CAS number of Octakis(trimethylsiloxy)silsesquioxane?

The CAS number of Octakis(trimethylsiloxy)silsesquioxane is 51777-38-9.

What are the molecular formula and molecular weight of Octakis(trimethylsiloxy)silsesquioxane?

Octakis(trimethylsiloxy)silsesquioxane has molecular formula C24H72O10Si11 and molecular weight 829.76300 g/mol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Octakis(trimethylsiloxy)silsesquioxane (CAS 51777-38-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-18450-8 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.