107-51-7

Name	POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED
CAS	107-51-7
EINECS(EC#)	203-497-4
Molecular Formula	C8 H24 O2 Si3
MDL Number	MFCD01325012
Molecular Weight	236.534
MOL File	107-51-7.mol

Chemical Properties

Appearance	clear colourless liquid
Melting point	-82 °C (lit.)
Boiling point	153 °C (lit.)
density	0.82 g/mL at 25 °C(lit.)
vapor density	>1 (vs air)
vapor pressure	5.3hPa at 25℃
refractive index	n20/D 1.384(lit.)
Fp	99 °F
storage temp.	Flammables area
solubility	Chloroform (Slightly), DMSO, Methanol (Slightly)
form	liquid
color	Colourless to Pale Yellow
Specific Gravity	0.82
Water Solubility	34μg/L at 23℃
Hydrolytic Sensitivity	1: no significant reaction with aqueous systems
Merck	6748
BRN	1753063
Dielectric constant	2.3（20℃）
Stability:	Hygroscopic
LogP	6.6 at 25.3℃
CAS DataBase Reference	107-51-7(CAS DataBase Reference)
EPA Substance Registry System	Trisiloxane, octamethyl- (107-51-7)

Safety Data

Risk Statements	R10:Flammable. less more
Safety Statements	S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) . S24/25:Avoid contact with skin and eyes . less more
RIDADR	UN 1993 3/PG 3
WGK Germany	3
F	10-21
TSCA	Yes
HazardClass	3.2
PackingGroup	III
HS Code	29319090

Hazard Information

Chemical Properties

POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED is clear colourless liquid

Application

As a basis for silicone oils or fluids designed to withstand extremes of temp; as a foam suppressant in petroleum lubricating oil.

Uses

As a basis for silicone oils or fluids designed to withstand extremes of temp; as a foam suppressant in petroleum lubricating oil.

Uses

POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED as an excipient Dimethicones in pharmaceutical and cosmetic applications can provide long lasting lubricant, smooth feel and spreads easily.

Uses

POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED is a linear silicone oligomer. Studies demonstrate that it is able to maintain the conformational stability of certain adsorbed proteins such as bovine serum albumin (BSA). Used in the methylation of mercury(II) salts.

Definition

ChEBI: Octamethyltrisiloxane is an organosiloxane that is trisiloxane in which all the hydrogens have been replaced by methyl groups.

General Description

Poly(dimethylsiloxane) (PDMS), also known as dimethicone, is an organosilicon compound that is widely used as a siloxane based elastomer. It is a hydrophobic material with attractive physical and chemical properties such as elasticity, optical transparency, tunable surface chemistry, and low electrical conductivity.

Flammability and Explosibility

Flammable

Purification Methods

Distil it twice, the middle fraction from the first distillation is again distilled, and the middle fraction of the second distillation is used. [Patnode & Wilcock J Am Chem Soc 68 358, Wolcock J Am Chem Soc 68 691 1946, Thompson J Chem Soc 1908 1953, Beilstein 4 IV 4115.]

Spectrum Detail

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