Pentamethylcyclopentasiloxane
- CAS NO.：6166-86-5
- Empirical Formula: C5H20O5Si5
- Molecular Weight: 300.64
- MDL number: MFCD00053531
- EINECS: 228-204-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-10-27 18:05:28
What is Pentamethylcyclopentasiloxane?
The Uses of Pentamethylcyclopentasiloxane
2,4,6,8,10-Pentamethylcyclopentasiloxane is an active reagent in the preparation of cyclolinear polysiloxanes and in the preparation of novel class of hybrid polyurethanes.
Flammability and Explosibility
Flammable
Properties of Pentamethylcyclopentasiloxane
| Melting point: | -108°C |
| Boiling point: | 54 °C/10 mmHg (lit.) |
| Density | 0.992 g/mL at 25 °C (lit.) |
| vapor pressure | 0.05-91Pa at 20℃ |
| refractive index | n |
| Flash point: | 39°C |
| storage temp. | 2-8°C |
| form | liquid |
| Specific Gravity | 0.998 |
| Water Solubility | 110-1000000000μg/L at 20℃ |
| Hydrolytic Sensitivity | 3: reacts with aqueous base |
| BRN | 1792134 |
| EPA Substance Registry System | Cyclopentasiloxane, 2,4,6,8,10-pentamethyl- (6166-86-5) |
Safety information for Pentamethylcyclopentasiloxane
| Signal word | Warning |
| Pictogram(s) |
 Flame Flammables GHS02 |
| GHS Hazard Statements |
H226:Flammable liquids |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233:Keep container tightly closed. P240:Ground/bond container and receiving equipment. P241:Use explosion-proof electrical/ventilating/lighting/…/equipment. P242:Use only non-sparking tools. P243:Take precautionary measures against static discharge. |
Computed Descriptors for Pentamethylcyclopentasiloxane
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