205389

Hexamethyldisiloxane

≥98%

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

Properties

• vapor density: >1 (vs air)
• Assay: ≥98%
• form: liquid
• refractive index: n20/D 1.377 (lit.)
• bp: 101 °C (lit.); 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

Description

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.

Safety Information

• Pictograms: GHS02,GHS09
• Signal Word: Danger
• Hazard Statements: H225,H410
• Precautionary Statements: P210 - P273
• Hazard Classifications: Aquatic Acute 1 - Aquatic Chronic 1 - Flam. Liq. 2
• Storage Class Code: 3 - Flammable liquids
• WGK: WGK 2
• Flash Point(F): 21.2 °F - closed cup
• Flash Point(C): -6 °C - closed cup
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves