Sunscreen Formulation: Emulsifier for High Powder/Silicone Content with Light Texture
Question
Regarding a high-powder physical sunscreen formulation:
My original formula contains high percentages of Zinc Oxide, Titanium Dioxide, Cyclomethicone, and Silicone Gel. I want to create a stable emulsion with a light texture without using Dimethicone.
I understand that Dimethicone has a heavier texture than Cyclomethicone. I am proposing a modified formula using Light Cream Maker with a high water percentage (71.5%).
Is this proposed modified formula (using Light Cream Maker with 71.5% water) feasible for emulsifying a silicone phase containing high percentages of Zinc Oxide and Titanium Dioxide stably, or is Warp Cream Maker the only suitable option for this type of high powder/silicone formulation?
Answer
Regarding your sunscreen formulation questions:
Your original formula contains high percentages of Zinc Oxide, Titanium Dioxide, Cyclomethicone, and Silicone Gel. Creating a stable emulsion with such high powder and silicone content requires a specific type of emulsifier designed for this purpose.
You asked about reducing the solvent (Cyclomethicone) if not using Dimethicone and if your proposed modified formula is feasible. As the staff mentioned, if you want a lighter texture without using Dimethicone, "Warp Cream Maker" is recommended. This emulsifier is specifically designed to create stable, light-textured emulsions with high powder loads like sunscreens, often dispersed in a silicone phase.
Your proposed modified formula uses "Light Cream Maker" with a very high water percentage (71.5%). While Light Cream Maker is a good general emulsifier, it may not be suitable for emulsifying a silicone phase containing high percentages of Zinc Oxide and Titanium Dioxide into such a large water phase stably. The staff's recommendation of "Warp Cream Maker" is likely because it is better suited for this specific type of formulation challenge (dispersing high powder/silicone content into an emulsion, especially for a light feel).
Therefore, it is highly recommended to follow the formulation guidelines and instructions provided for "Warp Cream Maker" or the general DIY physical sunscreen guide linked by the staff. These methods are proven to create stable and effective sunscreen emulsions. Attempting a formula with a different emulsifier like Light Cream Maker and a significantly different phase ratio (very high water) might result in an unstable product (separation, poor texture, or uneven dispersion of UV filters).