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205389

Hexamethyldisiloxane

≥98%

Synonym(s):

HMDSO

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About This Item

Linear Formula:
(CH3)3SiOSi(CH3)3
CAS Number:
107-46-0
Molecular Weight:
162.38
UNSPSC Code:
12352103
NACRES:
NA.22
PubChem Substance ID:
24852329
EC Number:
203-492-7
Beilstein/REAXYS Number:
1736258
MDL number:
MFCD00008265
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vapor density

>1 (vs air)

Quality Segment

assay

≥98%

form

liquid

refractive index

n20/D 1.377 (lit.)

bp

101 °C

mp

−59 °C (lit.)

density

0.764 g/mL at 20 °C (lit.)

SMILES string

C[Si](C)(C)O[Si](C)(C)C

InChI

1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3

InChI key

UQEAIHBTYFGYIE-UHFFFAOYSA-N

General description

Hexamethyldisiloxane (HMDSO), a linear polydisiloxane, is an organosilicon reagent commonly utilized as a source for plasma enhanced chemical vapor deposition (PE-CVD) of thin films of silicon compounds. It is also employed as a substitute to silane in silicon integrated circuit technology. Its dissociative ionization by electron impact has been studied by Fourier transform mass spectrometry. Synthesis of plasma-polymerized HMDSO thin films by atmospheric pressure glow (APG) discharge has been reported. Crystals of HMDSO at 148K are monoclinic. Addition of HMDSO to P4S10, improves its efficiency as thionating agent.

Application

Hexamethyldisiloxane can be used:
  • To fabricate a gas diffusion layer (GDL) with controlled hydrophobic silicone nano-layer by the dry deposition process.
  • To prepare silver nanoparticles coated with silica using arginine and glucose as the catalyst and the reducing agent, respectively.

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Pictograms

FlameEnvironment
GHS02,GHS09

Signal Word

Danger

Hazard Codes

H225,H410

Hazard Classifications

Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 2

Storage Class

3 - Flammable liquids

WGK

WGK 2

Flash Point (°F)

21.2 °F - closed cup

Flash Point (°C)

-6 °C - closed cup

PPE (personal protective equipment)

Eyeshields, Faceshields, Gloves, type ABEK (EN14387) respirator filter

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