Octamethyltrisiloxane Chemical Properties

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.)

Flash point:

99 °F

storage temp. 

Inert atmosphere,Room Temperature

solubility 

Chloroform (Slightly), DMSO, Methanol (Slightly)

form 

liquid

Specific Gravity

0.82

color 

Colourless to Pale Yellow

Water Solubility 

34μg/L at 23℃

Hydrolytic Sensitivity

1: no significant reaction with aqueous systems

Merck 

14,6748

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 Information

Risk Statements 

10

Safety Statements 

23-24/25

RIDADR 

UN 1993 3/PG 3

WGK Germany 

3

F 

10-21

TSCA 

Yes

HazardClass 

3.2

PackingGroup 

III

HS Code 

29319090

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Octamethyltrisiloxane Usage And Synthesis

Chemical Properties

Octamethyltrisiloxane is clear colourless liquid.

Uses

Octamethyltrisiloxane is a linear silicone oligomer. It is used as an excipient Dimethicones in pharmaceutical and cosmetic applications can provide long lasting lubricant, smooth feel and spreads easily. 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.

Application

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

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ChEBI: Octamethyltrisiloxane is an organosiloxane that is trisiloxane in which all the hydrogens have been replaced by methyl groups.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

Octamethyltrisiloxane(107-51-7)Related Product Information

• Benzyl isocyanide
• 3-Aminopropylbis(trimethylsiloxy)methylsilane
• TERT-BUTYL ISOCYANIDE
• METHYL ISOCYANOACETATE
• VINYLMETHYLBIS(TRIMETHYLSILOXY)SILANE
• Ethyl isocyanoacetate
• 3,3-DIPHENYLHEXAMETHYLTRISILOXANE
• SALCOMINE
• PHENYLSELENOL
• Tosylmethyl isocyanide
• (3-ACRYLOXYPROPYL)METHYLBIS(TRIMETHYLSILOXY)SILANE
• 3-PHENYLHEPTAMETHYLTRISILOXANE
• N-BUTYLISOCYANIDE
• 1,1,5,5-Tetraphenyltetramethyltrisiloxane
• TRIMETHYL PENTAPHENYL TRISILOXANE
• 1,1,3,3-TETRAMETHYLBUTYL ISOCYANIDE
• POLY(DIMETHYLSILOXANE), HYDROXY TERMINATED
• Poly(dimethylsiloxane)