Octaphenylsilsesquioxane
八苯基-POSS
Also known as: Octaphenyloctasilsesquioxane, PSS-Octaphenyl substituted, Octaphenyl-t8-silsesquioxane, 1,3,5,7,9,11,13,15-Octaphenylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane, Perphenyloctasilsesquioxane, Phenyl-POSS, Octaphenylpentacyclosilsesquioxane
Octaphenylsilsesquioxane (CAS 5256-79-1) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C48H40O12Si8 and a molecular weight of 1033.508 g/mol. It is also known as Octaphenyloctasilsesquioxane, PSS-Octaphenyl substituted and Octaphenyl-t8-silsesquioxane. Key properties include a melting point of >350ºC, a boiling point of 41.5ºC at 760mmHg and a density of 1.4±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 5256-79-1
- Jingsj CID
- J-2404-0
- Molecular Formula
- C48H40O12Si8
- Chinese Name
- 八苯基-POSS
- Molecular Weight
- 1033.508 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | >350ºC |
|---|---|
| Boiling Point | 41.5ºC at 760mmHg |
| Density | 1.4±0.1 g/cm3 |
Frequently Asked Questions
What is the CAS number of Octaphenylsilsesquioxane?
The CAS number of Octaphenylsilsesquioxane is 5256-79-1.
What are the molecular formula and molecular weight of Octaphenylsilsesquioxane?
Octaphenylsilsesquioxane has molecular formula C48H40O12Si8 and molecular weight 1033.508 g/mol.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Octaphenylsilsesquioxane (CAS 5256-79-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-2404-0 (accessed 2026-10-23).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.