Hexamethyldisiloxane

Hexamethyldisiloxane Basic information
Product Name:Hexamethyldisiloxane
Synonyms:os10;oxybis(trimethyl-silan;Oxybis(trimethylsilane);Silane, oxybis(trimethyl)-;sws-f221;SILICONE FLUID;2,2,4,4-TETRAMETHYL-3-OXA-2,4-DISILAPENTANE;HMDO
CAS:107-46-0
MF:C6H18OSi2
MW:162.38
EINECS:203-492-7
Product Categories:Chemical Synthesis;Organometallic Reagents;Siloxanes;Intermediates & Fine Chemicals;Pharmaceuticals;Organosilicon;Organics;Si (Classes of Silicon Compounds);Silicon Compounds (for Synthesis);Si-O Compounds;Synthetic Organic Chemistry;API Intermediate;1;T0001;107-46-0
Mol File:107-46-0.mol
Hexamethyldisiloxane Structure
Hexamethyldisiloxane Chemical Properties
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. Store below +30°C.
solubility 0.00037g/l insoluble
form liquid
Specific Gravity0.76
color Colorless to Almost colorless
explosive limit0.5-21.8%(V)
Water Solubility insoluble
Hydrolytic Sensitivity1: no significant reaction with aqueous systems
BRN 1736258
Stability:Stable, but moisture sensitive. Highly flammable. Incompatible with strong acids, strong bases, oxidizing agents.
InChIKeyUQEAIHBTYFGYIE-UHFFFAOYSA-N
LogP5.06 at 20℃
CAS DataBase Reference107-46-0(CAS DataBase Reference)
NIST Chemistry ReferenceDisiloxane, hexamethyl-(107-46-0)
EPA Substance Registry SystemHexamethyldisiloxane (107-46-0)
Safety Information
Hazard Codes F,N,T
Risk Statements 11-50/53-65-51/53-48/23/24/25-36/38-46-45
Safety Statements 16-61-62-45-26-53
RIDADR UN 1993 3/PG 2
WGK Germany 3
RTECS JM9237000
10
Autoignition Temperature340 °C
TSCA Yes
HazardClass 3
PackingGroup II
HS Code 29310095
Hazardous Substances Data107-46-0(Hazardous Substances Data)
ToxicityLD50 orally in Rabbit: > 12160 mg/kg LD50 dermal Rat > 2000 mg/kg
MSDS Information
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Hexamethyldisiloxane Usage And Synthesis
Chemical PropertiesHexamethyldisiloxane (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 propertiesHexamethyldisiloxane is a colorless and transparent liquid. It is easily deliquescent, flammable, and has the risk of causing combustion when exposed to high heat, open flame, and strong oxidizing agents. Boiling point 99.5℃. Flash point -1.1℃. Relative density (d2525) 0.7606. refractive index 1.3750. insoluble in water, soluble in many organic solvents.
UsesThe 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.
UsesHexamethyldisiloxane is used as a base fluid in a wide range of personal care products that require fast evaporation and high spreadability. When blended with Dimethicone fluids, It can adjust the residence time of the silicone on the skin. Unlike other volatile fluids, Hexamethyldisiloxane Fluid does not cool the skin as it evaporates. Hexamethyldisiloxane is used as a carrying agent and diluent in the following: skin cream lotions, bath oils, suntan lotions, nail polishes, antiperspirants, deodorants, hair sprays and other beauty and hair care products.
A silicon based compound that can be used to create potentially biocompatible materials.
Used as a monomer in the synthesis of long chain polysiloxane structures.
Used in the methylation of mercury(II) salts.
UsesHexamethyldisiloxane can be used as silylating agent for carboxylic acids, and alcohols; used in preparation of aroyl chlorides; precursor for a variety of trimethylsilyl derivatives.Hexamethyldisiloxane has been used as an inexpensive starting material for the preparation of numerous synthetically useful trimethylsilyl derivatives.
PreparationSynthesis of hexamethyldisiloxane by hydrolysis of trimethylsilyl chloride, water and sodium hydroxide.
DefinitionChEBI: Hexamethyldisiloxane is an organosiloxane consisting of two trimethylsilyl groups covalently bound to a central oxygen.
Production MethodsProduced via acid hydrolysis of chlorotrimethylsilane and purification by distillation.
General DescriptionHexamethyldisiloxane (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 ExplosibilityHighlyflammable
Purification MethodsFractionally 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.]
Hexamethyldisilazane Hexamethylcyclotrisiloxane Chlorodimethylphenylsilane Dimethicone HEXAPHENYLDISILOXANE Hexamethyldisiloxane tert-Butyl methyl ether Dimethyldimethoxysilane BIS(BROMOMETHYL)TETRAMETHYLDISILOXANE 1,3-Bis(trimethylsilyl)urea 1,3-Bis(chloromethyl)-1,1,3,3-tetramethyldisiloxane POLYDIMETHYLSILOXANE POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED Dimethyl disulfide Dichlorodimethylsilane Disiloxane, 1,3-diethenyl-1,1,3,3-tetramethyl-,Disiloxane, 1,1,3,3-tetramethyl-1,3-divinyl- 1,3-BIS(3-CYANOPROPYL)TETRAMETHYLDISILOXANE HEXAETHYLDISILOXANE

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