CAS 107-51-7 Octamethyltrisiloxane - Materials / Alfa Chemistry

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Octamethyltrisiloxane

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Catalog Number

ACM107517-2

CAS Number

107-51-7

Product Name

Octamethyltrisiloxane

Structure

Category

Salt

Description

Liquid

IUPAC Name

dimethyl-bis(trimethylsilyloxy)silane

Molecular Weight

236.53g/mol

Molecular Formula

C8H24O2Si3

Canonical SMILES

C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C

InChI

InChI=1S/C8H24O2Si3/c1-11(2,3)9-13(7,8)10-12(4,5)6/h1-8H3

InChI Key

CXQXSVUQTKDNFP-UHFFFAOYSA-N

Boiling Point

153.0 °C

Melting Point

-80.0 °C

Density

0.940 g/cu m @ 25 °C /Silicon fluid with 10 sq mm/s viscosity/

Solubility

1.44e-07 M;Immiscible with water;Immiscible with alcohol;Miscible with chloroform; soluble in chlorinated hydrocarbons, benzene, toluene, xylene, n-hexane, petroleum spirits, ether, amyl acetate; very slightly soluble in isopropyl alcohol; insoluble in methanol, acetone

Application

Octamethyltrisiloxane serves as a versatile component primarily utilized in pharmaceutical and cosmetic applications, thanks to its properties as a clear, colorless liquid and linear silicone oligomer. It functions effectively as an excipient in formulations where Dimethicones are desired to offer long-lasting lubrication, a smooth feel, and ease of spreading. Additionally, it plays a crucial role in maintaining the conformational stability of specific adsorbed proteins, like bovine serum albumin (BSA). Beyond its primary uses, Octamethyltrisiloxane is employed in the methylation of mercury(II) salts and serves as a foundational element in silicone oils or fluids designed to endure extreme temperatures, as well as acting as a foam suppressant in petroleum lubricating oil.

Color/Form

Colorless oil;Clear colorless liquids

Complexity

149

Covalently-Bonded Unit Count

EC Number

203-497-4;613-156-5;618-433-4

Exact Mass

236.10841g/mol

Formal Charge

Heavy Atom Count

Log P

6.6 (LogP)

MeSH Entry Terms

dimethicone;dimethyl polysiloxane;dimeticone

Monoisotopic Mass

236.10841g/mol

Other Experimental

Silcone oil consisting of dimethylsiloxane polymers range in viscosities from 0.65-1,000,000 centistokes at room temp;Low surface tension, inert /Silicones/;Index of refraction: 1.4013 to 1.4053 at 35 °C; viscosity at 25 °C: 350 cSt; density: 0.965-0.973 /Dimethicone 350/;Viscosity: 41 cSt at 37.8 °C /Silicone fluid with 10 mm sq/S viscosity/;DIMETHYLPOLYSILOXANES ARE PRACTICALLY INERT POLYMERS

Refractive Index

Index of refraction 1.399 @ 20 °C/D /Silicone fluid with 10 mm sq/5 viscosity

Rotatable Bond Count

Stability

Stable to heat and ... resistant to most chemical substances, although they are affected by strong acids.

UNII

9G1ZW13R0G

Vapor Density

Pour point -73 °C; Electric Strength 1.4 KV/um; Electric Constant 2.60; Thermal conductivity at 65 °C = 1.3 W/(m.k). /Silicone fluid with 10 mm sq/5 viscosity/

Vapor Pressure

3.34 mmHg

Viscosity

Viscosity increases with degree of polymerization;10 cu mm/S @ 25 °C /Silicone fluid with 10 mm sq/S viscosity/

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