Pentamethyldisiloxane
Also known as: 1,1,1,3,3-Pentamethyldisiloxane, Pentamethyl Disiloxane, Trimethylsiloxydimethylsilane, Dimethyl(trimethylsilyloxy)silane, Disiloxane, pentamethyl-, HMe2SiOSiMe3, 2,2,4-Trimethyl-3-oxa-2,4-disilapentane, EINECS 215-873-5, MFCD00053658
Pentamethyldisiloxane (CAS 1438-82-0) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C5H16OSi2 and a molecular weight of 148.351 g/mol. Key properties include a melting point of 86 °C(lit.), a boiling point of 84.5±9.0 °C at 760 mmHg, a density of 0.758 and a flash point of 4.9±18.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1438-82-0
- Jingsj CID
- J-41037-7
- Molecular Formula
- C5H16OSi2
- Molecular Weight
- 148.351 g/mol
- Category
- Aliphatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 86 °C(lit.) |
|---|---|
| Boiling Point | 84.5±9.0 °C at 760 mmHg |
| Density | 0.758 |
| Flash Point | 4.9±18.7 °C |
| Exact Mass | 148.073975 |
| PSA | 9.23000 |
| LogP | 3.54 |
| Vapor Pressure | 80.5±0.1 mmHg at 25°C |
| Refractive Index | n20/D 1.373 |
| Additional Property | Not miscible or difficult to mix in water. |
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 Pentamethyldisiloxane?
The CAS number of Pentamethyldisiloxane is 1438-82-0.
What are the molecular formula and molecular weight of Pentamethyldisiloxane?
Pentamethyldisiloxane has molecular formula C5H16OSi2 and molecular weight 148.351 g/mol.
What are the upstream and downstream products of Pentamethyldisiloxane?
For Pentamethyldisiloxane, Upstream Products: 1,1,3,3-Tetramethyldisiloxane, Hexamethyldisiloxane, Pentamethyldisilane; Downstream Products: 1-ethenyl-1,1,3,3,3-pentamethyldisiloxane, (3-Glycidoxypropyl)pentamethyldisiloxane, 3-(Pentamethyldisiloxanyl)propyl methacrylate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Pentamethyldisiloxane (CAS 1438-82-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-41037-7 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.