1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane

十一甲基五硅氧烷

Also known as: 1,1,1,3,3,5,5,7,7,9,9-undecaMethylpentasiloxane, Pentasiloxane, 1,1,1,3,3,5,5,7,7,9,9-undecaMethyl-, Pentasiloxane, 1,1,1,3,3,5,5,7,7,9,9-undecamethyl-, dimethylsilyloxy-[[dimethyl(trimethylsilyloxy)silyl]oxy-dimethylsilyl]oxy-dimethylsilane, undecamethylpentasiloxane

1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane (CAS 17066-04-5) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C11H34O4Si5 and a molecular weight of 370.81300 g/mol. It is also known as 1,1,1,3,3,5,5,7,7,9,9-undecaMethylpentasiloxane, Pentasiloxane, 1,1,1,3,3,5,5,7,7,9,9-undecaMethyl- and Pentasiloxane, 1,1,1,3,3,5,5,7,7,9,9-undecamethyl-. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 17066-04-5
Jingsj CID: J-1966709-8
Molecular Formula: C₁₁H₃₄O₄Si₅
Chinese Name: 十一甲基五硅氧烷
Molecular Weight: 370.81300 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Frequently Asked Questions

What is the CAS number of 1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane?

The CAS number of 1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane is 17066-04-5.

What are the molecular formula and molecular weight of 1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane?

1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane has molecular formula C11H34O4Si5 and molecular weight 370.81300 g/mol.

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

Last updated: 8/21/2026

How to cite: Jingsj. "1,1,1,3,3,5,5,7,7,9,9-undecamethylpentasiloxane (CAS 17066-04-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1966709-8 (accessed 2026-10-24).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.