| Identification | More | [Name]
Hexamethyldisiloxane | [CAS]
107-46-0 | [Synonyms]
2,2,4,4-TETRAMETHYL-3-OXA-2,4-DISILAPENTANE
BIS(TRIMETHYLSILYL)ETHER
HEXAMETHYLDISILOXANE
HMDO
HMDSO
POLY(DIMETHYLSILOXANE)
SILICONE FLUID
((CH3)3Si)2O
1,1,1,3,3,3-Hexamethyldisiloxane
1,1,1,3,3,3-Hexamethyl-disiloxane
belsildm0.65
Bis(trimethylsilyl) oxide
bis(trimethylsilyl)oxide
bis-trimethylsilyloxide
CH7310
DC 200 FLUID
Disiloxane,hexamethyl-
Fluka AG
H7310
hexamethyl-disiloxan | [EINECS(EC#)]
203-492-7 | [Molecular Formula]
C6H18OSi2 | [MDL Number]
MFCD00008265 | [Molecular Weight]
162.38 | [MOL File]
107-46-0.mol |
| Chemical Properties | Back Directory | [Appearance]
Colorless or yellowish transparent liquid | [Melting point ]
−59 °C(lit.)
| [Boiling point ]
101 °C(lit.)
| [density ]
0.764 g/mL at 20 °C(lit.)
| [vapor density ]
>1 (vs air)
| [vapor pressure ]
20 hPa (20 °C) | [refractive index ]
n20/D 1.377(lit.)
| [Fp ]
33 °F
| [storage temp. ]
Flammables area | [solubility ]
0.00037g/l insoluble | [form ]
liquid | [color ]
Colorless to Almost colorless | [Specific Gravity]
0.76 | [Stability:]
Stable, but moisture sensitive. Highly flammable. Incompatible with strong acids, strong bases, oxidizing agents. | [explosive limit]
0.5-21.8%(V) | [Water Solubility ]
insoluble | [Specific Heat Capacity]
Cp(liquid):311.4J/(g·K);Cp(gas):1.46878J/(g·K),at 25℃ | [Hydrolytic Sensitivity]
1: no significant reaction with aqueous systems | [Detection Methods]
GC,NMR | [BRN ]
1736258 | [Henry's Law Constant]
1.3×10-6 mol/(m3Pa) at 25℃, Xu and Kropscott (2014) | [Dielectric constant]
2.2（20℃） | [Cosmetics Ingredients Functions]
ANTIFOAMING
SKIN CONDITIONING - MISCELLANEOUS | [InChI]
1S/C6H18OSi2/c1-8(2,3)7-9(4,5)6/h1-6H3 | [InChIKey]
UQEAIHBTYFGYIE-UHFFFAOYSA-N | [SMILES]
C[Si](C)(C)O[Si](C)(C)C | [LogP]
5.06 at 20℃ | [Uses]
The most popular precursor chemical is hexamethyldisiloxane (HMDS) which with the addition of helium and oxygen will produce a silica coating. it is used in a variety of consumer applications and can be used as intermediates in the production of silicone polymers. | [CAS DataBase Reference]
107-46-0(CAS DataBase Reference) | [NIST Chemistry Reference]
Disiloxane, hexamethyl-(107-46-0) | [Storage Precautions]
Moisture sensitive;Store under nitrogen | [EPA Substance Registry System]
107-46-0(EPA Substance) |
| Safety Data | Back Directory | [Symbol(GHS) ]
 
GHS02,GHS09 | [Signal word ]
Danger | [Hazard statements ]
H225-H410 | [Precautionary statements ]
P210-P273 | [Hazard Codes ]
F | [Risk Statements ]
R11:Highly Flammable. | [Safety Statements ]
S16:Keep away from sources of ignition-No smoking . | [RIDADR ]
UN 1993 3/PG 2
| [WGK Germany ]
3
| [RTECS ]
JM9237000
| [F ]
10 | [Autoignition Temperature]
340 °C | [TSCA ]
Yes | [REACH Registrations]
Active | [HazardClass ]
3 | [PackingGroup ]
II | [HS Code ]
29310095 | [Storage Class]
3 - Flammable liquids | [Hazard Classifications]
Aquatic Acute 1
Aquatic Chronic 1
Flam. Liq. 2 | [Hazardous Substances Data]
107-46-0(Hazardous Substances Data) | [Toxicity]
LD50 orally in Rabbit: > 12160 mg/kg LD50 dermal Rat > 2000 mg/kg |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
Chlorotrimethylsilane-->N-Methylaniline-->(chlorodifluoroMethyl)triMethylsilane-->Silane, trimethyl(trifluoroethenyl)--->Silane, 1,1'-(difluoromethylene)bis[1,1,1-trimethyl--->(Difluoromethyl)trimethylsilane-->Chlorodimethylvinylsilane-->1,1,1,3,5,5,5-Heptamethyltrisiloxane-->Divinyltetramethyldisiloxane-->Vinylpentamethyldisiloxane-->1,1,1,3,3,5,5-Heptamethyltrisiloxane-->Decamethyltetrasiloxane-->Pentamethyldisiloxane | [Preparation Products]
2-Bromo-1-(2-(trifluoromethyl)thiazol-5-yl)ethanone-->2-(Trifluoromethyl)thiazole-5-carbaldehyde-->5-(Chloromethyl)-2-(trifluoromethyl)thiazole-->1,2-Diiodoethane-->Ethyl 2-(trifluoromethyl)thiazole-5-carboxylate-->(2-(Trifluoromethyl)thiazol-5-yl)methanol-->Iodotrimethylsilane-->Xanthophyll-->Dibutyl sulfide |
| Hazard Information | Back Directory | [Chemical Properties]
Hexamethyldisiloxane (HMDS) is a colorless or yellowish transparent liquid with a measured melting point of -68.2°C and a measured boiling point of 100.5°C at 1013 hPa. The measured vapor pressure is 44.51 hPa at 20 oC. The measured water solubility is 0.93 ± 0.63 mg/L at 23 oC. The measured log Kow of HMDS is 5.20 at 20 oC. Estimated log Koc values using EPISuite v 4.10 range from 2.5 (MCI method) to 4.5 (Kow method). As Episuite does not contain fragments for siloxanes for log Koc predictions, these values should be treated with caution. The potential for hydrolysis of the test substance may have influenced the determination of partition coefficient and water solubility. | [Physical properties]
mp ?59 °C; bp 101 °C/760 mmHg;
d 0.764 g cm?3. | [Definition]
ChEBI: An organosiloxane consisting of two trimethylsilyl groups covalently bound to a central oxygen. | [Preparation]
Synthesis of hexamethyldisiloxane by hydrolysis of trimethylsilyl chloride, water and sodium hydroxide. | [Production Methods]
Produced via acid hydrolysis of chlorotrimethylsilane and
purification by distillation. | [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. | [Flammability and Explosibility]
Highlyflammable(100%) | [reaction suitability]
reagent type: derivatization reagent
reaction type: Silylations | [Purification Methods]
Fractionally distil through a column packed with glass helices with ca 15 theoretical 20 1.3777. plates. It is highly flammable and is an irritant. [Mills & McKenzie J Am Chem Soc 76 2672 1954, Csakvari et al. J Organometal Chem 107 287 1976, Beilstein 4 IV 4018.] | [Toxics Screening Level]
The ITSL for hexamethyldisiloxane is 240 μg/m3 based on an annual averaging time for dispersion modeling. |
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