Functional Roles
Industries Served
Physical Properties
melting_point
-66 u00b0C
boiling_point
99 u00b0C
density
0.7638 at 20 u00b0C
solubility
In water, 0.93 mg/L at 25 u00b0C
vapor_pressure
42.0 [mmHg]
flash_point
-30 u00b0C
GHS / SDS Safety
Danger
Environmental Hazard
Irritant
Health Hazard
Flammable
- H315: Causes skin irritation [Warning Skin corrosion/irritation]
- H225: Highly Flammable liquid and vapor [Danger Flammable liquids]
- H400: Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
- Not Classified
- H225 (98.8%): Highly Flammable liquid and vapor [Danger Flammable liquids]
- H332: Harmful if inhaled [Warning Acute toxicity, inhalation]
- H411 (71.3%): Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]
- H410 (19.3%): Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]
- H400 (92.6%): Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
- H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure]
- H410: Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]
Chemical Identity
| CAS Number | 107-46-0 |
| IUPAC Name | trimethyl(trimethylsilyloxy)silane |
| InChI Key | UQEAIHBTYFGYIE-UHFFFAOYSA-N |
| PubChem CID | 24764 |
| INCI Name | DISILOXANE |
Synonyms & Trade Names
Full Description
Hexamethyldisiloxane (HMDSO) is the shortest linear siloxane, consisting of two trimethylsilyl groups linked by an oxygen bridge. It has very low molecular weight, very low viscosity (~0.65 cSt at 25°C), and high volatility. HMDSO is used as a chain stopper in PDMS polymer production, as a carrier fluid, and as a laboratory solvent.