1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane

十八烷基七甲基三硅氧烷

Also known as: Stearyl trimethicone, Stearyl trisiloxane, Bis(trimethylsiloxy)octadecylmethylsilane, Trimethyl-(methyl-octadecyl-trimethylsilyloxysilyl)oxysilane, Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-octadecyl-, UNII-796MG354ZZ, octadecylheptamethyltrisiloxane, 3-octadecylheptamethyltrisiloxane, Tm 181

1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane (CAS 167160-55-6) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C25H58O2Si3 and a molecular weight of 474.983 g/mol. It is also known as Stearyl trimethicone, Stearyl trisiloxane and Bis(trimethylsiloxy)octadecylmethylsilane. Key properties include a boiling point of 454.2±28.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 201.4±24.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 167160-55-6
Jingsj CID: J-1151840-0
Molecular Formula: C₂₅H₅₈O₂Si₃
Chinese Name: 十八烷基七甲基三硅氧烷
Molecular Weight: 474.983 g/mol
Category: Aliphatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	454.2±28.0 °C at 760 mmHg
Density	0.8±0.1 g/cm3
Flash Point	201.4±24.4 °C

Frequently Asked Questions

What is the CAS number of 1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane?

The CAS number of 1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane is 167160-55-6.

What are the molecular formula and molecular weight of 1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane?

1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane has molecular formula C25H58O2Si3 and molecular weight 474.983 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. "1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane (CAS 167160-55-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1151840-0 (accessed 2026-10-26).

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