107-46-0
Product Name:
Hexamethyldisiloxane
Formula:
C6H18OSi2
Synonyms:
2,2,4,4-Tetramethyl-3-oxa-2,4-disilapentane, HMDSO;Hexamethyldisiloxane;HMDSO;Poly(dimethylsiloxane)
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CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Dry Powder; Liquid |
|---|---|
| Color/Form | FLUID |
| Boiling Point | 99 °C |
| Melting Point | -66 °C |
| Flash Point | -30 °C |
| Solubility | In water, 0.93 mg/L at 25 °C |
| Density | 0.7638 at 20 °C |
| Vapor Pressure | 42.0 [mmHg] |
| LogP | log Kow = 4.2 |
| Henry's Law Constant | Henry's Law constant = 4.53X10-2 atm-cu m/mol at 25 °C |
| Decomposition | When heated to decomposition it emits acrid smoke, fumes. |
| Viscosity | 0.51 centistokes at 20 °C |
| Refractive Index | Index of Refraction: 1.3774 at 20 °C |
| Kovats Retention Index | 597.4 597.4 598 645 646 |
| Other Experimental Properties | FREEZING POINT: -68 °C |
| Chemical Classes | Metals -> Metalloid Compounds (Silicon) |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Flame Flammables GHS02  Environment GHS09 |
| GHS Hazard Statements |
H225:Flammable liquids H410:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P273:Avoid release to the environment. |
COMPUTED DESCRIPTORS
| Molecular Weight | 162.38 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 1 |
| Rotatable Bond Count | 2 |
| Exact Mass | 162.08961826 g/mol |
| Monoisotopic Mass | 162.08961826 g/mol |
| Topological Polar Surface Area | 9.2 Ų |
| Heavy Atom Count | 9 |
| Formal Charge | 0 |
| Complexity | 76.2 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Hexamethyldisiloxane is an organosiloxane consisting of two trimethylsilyl groups covalently bound to a central oxygen.
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