2,4,6,8,10-pentamethylcyclopentasiloxane
Also known as: pentamethylcyclopentasiloxane, 1,3,5,7,9-pentamethylcyclopentasiloxane, Cyclopentasiloxane, 2,4,6,8,10-pentamethyl-, D5H, LS 8990, 2,4,6,8,10-Pentamethylcyclodecanepentasiloxane, 2,4,6,8,10-Pentamethyl-1,3,5,7,9,2,4,6,8,10-pentaoxapentasilecane
2,4,6,8,10-pentamethylcyclopentasiloxane (CAS 6166-86-5) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H15O5Si5 and a molecular weight of 295.60000 g/mol. Key properties include a melting point of -108ºC, a boiling point of 169.0±0.0 °C at 760 mmHg, a density of 0.992 g/mL at 25ºC(lit.) and a flash point of 52.9±18.7 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour. No supplier offers are currently listed; request a quote. Record last updated Nov 2, 2026.
- CAS No.
- 6166-86-5
- Jingsj CID
- J-40941-8
- Molecular Formula
- C5H15O5Si5
- Molecular Weight
- 295.60000 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 11/2/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -108ºC |
|---|---|
| Boiling Point | 169.0±0.0 °C at 760 mmHg |
| Density | 0.992 g/mL at 25ºC(lit.) |
| Flash Point | 52.9±18.7 °C |
| Exact Mass | 300.015717 |
| PSA | 46.15000 |
| Appearance | liquid |
| Vapor Pressure | 2.1±0.3 mmHg at 25°C |
| Refractive Index | n20/D 1.392(lit.) |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
Customs & Trade Information
| HS Code | 2901100000 |
|---|---|
| Summary | 2901100000 saturated acyclic hydrocarbons。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:2.0%。General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 2,4,6,8,10-pentamethylcyclopentasiloxane?
The CAS number of 2,4,6,8,10-pentamethylcyclopentasiloxane is 6166-86-5.
What are the molecular formula and molecular weight of 2,4,6,8,10-pentamethylcyclopentasiloxane?
2,4,6,8,10-pentamethylcyclopentasiloxane has molecular formula C5H15O5Si5 and molecular weight 295.60000 g/mol.
Is 2,4,6,8,10-pentamethylcyclopentasiloxane hazardous?
2,4,6,8,10-pentamethylcyclopentasiloxane has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour.
What are the upstream and downstream products of 2,4,6,8,10-pentamethylcyclopentasiloxane?
For 2,4,6,8,10-pentamethylcyclopentasiloxane, Upstream Products: Dichloromethylsilane, Water, Chlorotrimethylsilane; Downstream Products: 1,1,1,3,5,5,5-Heptamethyltrisiloxane.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,4,6,8,10-pentamethylcyclopentasiloxane (CAS 6166-86-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-40941-8 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.