Names | |
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Preferred IUPAC name
Hexamethyldisiloxane | |
Other names
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Identifiers | |
3D model (JSmol)
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Abbreviations | HMDSO, (TMS)2O |
1736258 | |
ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.003.176 |
EC Number |
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MeSH | Hexamethyldisiloxane |
PubChem CID
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RTECS number |
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UNII | |
UN number | 1993 |
CompTox Dashboard (EPA)
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Properties | |
C6H18OSi2 | |
Molar mass | 162.379 g·mol−1 |
Appearance | Colourless liquid |
Density | 0.764 g·cm−3 |
Melting point | −59 °C (−74 °F; 214 K) |
Boiling point | 100 to 101 °C (212 to 214 °F; 373 to 374 K) |
930.7±33.7 ppb (23 °C) [1] | |
Vapor pressure | 43 hPa (20 °C) [2] |
Refractive index (nD)
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1.377 |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards
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GHS labelling: | |
[2] | |
Danger[2] | |
H225, H410[2] | |
P210, P233, P240, P273, P403+P235[2] | |
NFPA 704 (fire diamond) | |
Flash point | −1(1) °C |
Related compounds | |
Related compounds
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hexamethyldisiloxane (HMDSO or MM) is an organosilicon compound with the formula O[Si(CH3)3]2. This volatile colourless liquid is used as a solvent and as a reagent in organic synthesis. It is prepared by the hydrolysis of trimethylsilyl chloride. The molecule is the protypical disiloxane and resembles a subunit of polydimethylsiloxane.