Trisiloxane Solubility and Viscosity Reduction in Sunscreen

Question

I am developing a sunscreen formula containing LipidSoft Dry and Isododecane. I am interested in using Trisiloxane to help reduce the viscosity of the formula. Can you please confirm the solubility of Trisiloxane, specifically whether it dissolves in LipidSoft and Isododecane? Is Trisiloxane suitable for reducing viscosity in this type of formula?

MySkinRecipes Expert · Accepted Answer

Regarding the solubility of Trisiloxane:

Trisiloxane dissolves in all types of Silicone.
Trisiloxane does not dissolve in LipidSoft or Isododecane. (Solubility rates are not available).

Regarding using Trisiloxane to reduce viscosity in your sunscreen formula:

Your formula contains LipidSoft Dry and Isododecane.
Since Trisiloxane does not dissolve in LipidSoft or Isododecane, it is not suitable for replacing these ingredients to reduce the formula's viscosity.
The staff previously recommended replacing LipidSoft Dry with Isododecane to reduce viscosity, which is a suitable approach given the components of your formula.

Therefore, using Trisiloxane to replace LipidSoft Dry or Isododecane to reduce viscosity in this specific formula is not recommended based on its solubility properties and the staff's advice.