Octamethyltrisiloxane is clear colourless liquid.
As a basis for silicone oils or fluids designed to withstand extremes of temp; as a foam suppressant in petroleum lubricating oil.
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.
ChEBI: Octamethyltrisiloxane is an organosiloxane that is trisiloxane in which all the hydrogens have been replaced by methyl groups.
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
The synthesis of polyether-modified polysiloxane copolymer adopts the condensation method, in which hydrogen-containing silicone oil and polyether are condensed and grafted under the action of catalyst. In a four-mouth flask equipped with a stirrer, condenser, thermometer and hydrogen export device, add hydrogen-containing silicone oil, polyether, solvent and catalyst according to the proportion, open the stirrer, slowly heated to a certain temperature, at this time, there is hydrogen escaped to produce bubbles, when the conversion rate to a certain value, lower the temperature, add alkali and neutralization, after filtration and distillation under reduced pressure to remove the catalyst and solvent residue, i.e., polyether-modified polysiloxane copolymers. Octamethyltrisiloxane is prepared by nitrile condensation reaction with polydimethylsiloxane and octamethylcyclotetrasiloxane as starting materials.
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.]
The initial threshold screening level (ITSL) for octamethyltrisiloxane (CASRN 107-51-7) remains
at 0.1 μg/m 3 based on an annual averaging time.
