Silicone-Based Sunscreen Formulation with Specific UV Filters

Question

I am looking for a silicone-based sunscreen formula using the following UV filters:

Tris-Biphenyl Triazine (Nano) 4%
Octocrylene 5%
DHHB 5%
Zinc Oxide 200nm 10%
Titanium Dioxide 3%

Initially, I planned to make an emulsion formula, but after checking the information for Tris-Biphenyl Triazine (Nano), I learned it cannot be used in a waterproof formula containing Water in Oil. Therefore, I would like to adjust the formula to be silicone-based.

I have tried searching for formulas from other members but could not find one.

Could you please recommend a silicone-based formula that incorporates the above UV filters, along with the mixing procedure?

I need the cream texture to be waterproof, sweatproof, and non-staining.

MySkinRecipes Expert · Accepted Answer

Silicone-Based Sunscreen Formula

Here is a proposed silicone-based sunscreen formula incorporating the UV filters you specified, designed to be waterproof and provide a non-staining finish. This type of formula is suitable given the compatibility considerations for Tris-Biphenyl Triazine (Nano).

Formula Composition:

Tris-Biphenyl Triazine (Nano): 4%
Octocrylene: 5%
DHHB (Diethylamino Hydroxybenzoyl Hexyl Benzoate): 5%
Zinc Oxide 200nm EasyDisperse™: 10%
Titanium Dioxide 200nm EasyDisperse™: 3%
Silicone Gel 9040: 55%
Silicone Film: 18%

Total: 100%

Mixing Procedure:

Phase A (Silicone/Oil Phase): Combine Octocrylene, DHHB, Silicone Gel 9040, and Silicone Film. Gently heat this phase to approximately 80°C while stirring until the DHHB is fully dissolved. Allow the mixture to cool slightly.
Phase B (Powder Dispersion): In a separate container, weigh out Zinc Oxide 200nm EasyDisperse™ and Titanium Dioxide 200nm EasyDisperse™. Add a small amount of the cooled Phase A mixture to the powders to create a thick slurry. Use a high-shear mixer or a mortar and pestle to ensure the powders are completely dispersed and there are no aggregates. Gradually add the remaining Phase A mixture to the powder dispersion, mixing well until uniform.
Phase C (Tris-Biphenyl Triazine): Add Tris-Biphenyl Triazine (Nano) to the combined mixture from Phase A and B.
Final Mixing: Mix the entire batch thoroughly until a smooth, homogeneous silicone gel sunscreen is obtained.

This silicone-based formula should provide effective broad-spectrum UV protection with a water-resistant, non-greasy feel, addressing your requirements.