Octamethyltrisiloxane
Also known as: 1,1,1,3,3,5,5,5-Octamethyltrisiloxane, Dimethylbis(trimethylsilyloxy)silane, Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl-, [(CH3)3SiO]2Si(CH3)2, MFCD00008264, EINECS 203-497-4, Poly(Dimethylsiloxane) (low molecular weight), Methylpolysiloxane, CO9816
Octamethyltrisiloxane (CAS 107-51-7) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C8H24O2Si3 and a molecular weight of 236.531 g/mol. Key properties include a melting point of -82 °C, a boiling point of 153.0±0.0 °C at 760 mmHg, a density of 0.8±0.1 g/cm3 and a flash point of 55.0±23.0 °C. It is classified under GHS with signal word Warning and hazard statements H226 — Flammable liquid and vapour and H410 — Very toxic to aquatic life with long lasting effects. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 107-51-7
- Jingsj CID
- J-1032435-3
- Molecular Formula
- C8H24O2Si3
- Molecular Weight
- 236.531 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -82 °C |
|---|---|
| Boiling Point | 153.0±0.0 °C at 760 mmHg |
| Density | 0.8±0.1 g/cm3 |
| Flash Point | 55.0±23.0 °C |
| Exact Mass | 236.108414 |
| PSA | 18.46000 |
| LogP | 4.74 |
| Additional Property | >1 (vs air) |
| Vapor Pressure | 4.4±0.2 mmHg at 25°C |
| Refractive Index | 1.405 |
| Storage Conditions | Flammables area |
GHS Safety & Compliance
- H226 — Flammable liquid and vapour
- H410 — Very toxic to aquatic life with long lasting effects
Customs & Trade Information
| HS Code | 2934999090 |
|---|---|
| Summary | 2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of Octamethyltrisiloxane?
The CAS number of Octamethyltrisiloxane is 107-51-7.
What are the molecular formula and molecular weight of Octamethyltrisiloxane?
Octamethyltrisiloxane has molecular formula C8H24O2Si3 and molecular weight 236.531 g/mol.
Is Octamethyltrisiloxane hazardous?
Octamethyltrisiloxane has GHS signal word Warning and hazard statements H226 — Flammable liquid and vapour; H410 — Very toxic to aquatic life with long lasting effects.
What are the upstream and downstream products of Octamethyltrisiloxane?
For Octamethyltrisiloxane, Upstream Products: Hexamethyldisiloxane, Octamethylcyclotetrasiloxane, 1-(Chloromethyl)-1,1,3,3,3-pentamethyldisiloxane; Downstream Products: Hexamethyldisiloxane, Butyl formate, Trimethylfluorosilane.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Octamethyltrisiloxane (CAS 107-51-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1032435-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.