The material selection platform
Cosmetics Ingredients
The material selection platform
Cosmetics Ingredients


CAS Number 107-51-7 / 63148-62-9
Chem/IUPAC Name: Dimethyl-bis(trimethylsilyloxy)silane
EINECS/ELINCS No: 203-497-4 / 613-156-5 / 687-578-3
COSING REF No: 59885
An organosiloxane called octamethyltrisiloxane is a trisiloxane in which all the hydrogen atoms have been exchanged for methyl groups. Trisiloxane surfactants, also known as polyetherdimethylsiloxanes (PEMS), are superspreaders or superwetters and are added to cosmetics to increase the activity of the active ingredients by facilitating rapid spreading. Trisiloxane is a clear, colorless, volatile, and easily spreadable fluid functioning mainly as a defoamer.

What is TRISILOXANE used for?

Trisiloxane functions as an anti-foaming agent to prevent foaming when cosmetic products are made or used. It enables the skin to remain healthy. It leaves the skin feeling smooth, and non-greasy.


Equilibrium polymerization of cyclic or linear dimethylsilicone precursors produces polydimethylsiloxane oils such as Trisiloxane.

What does TRISILOXANE do in a formulation?

  • Antifoaming
  • Skin conditioning

Safety profile

Trisiloxane has received a score of 2 on the Environmental Working Group’s (EWG) skin-deep scoring scale. Despite having some hazard profile issues, the chemical has passed the Safer Choice Criteria for its functional ingredient-class. It is recognized by Health Canada as an acceptable non-medicinal ingredient in natural health products where it can be used as an antifoaming and skin-conditioning agent and is listed in the Natural Health Products Ingredients Database (NHPID). It may result in liver changes and short-term discomfort and redness if it comes in contact with eyes.

Technical profile

Property Values
Boiling Point 153°C
Melting Point -82°C
Solubility Insoluble in water
Back to Top