Homemade Physical Sunscreen Formula Review for Texture and SPF 50

Subject: Homemade Sunscreen Formula

Based on your goal to create a homemade physical sunscreen with a soft, smooth, non-sticky texture and SPF 50, and incorporating the feedback from the staff, here is a review of your proposed formula and mixing method:

Revised Formula:

1. Water: Remaining (approx. 61%)
2. SiliSolve Plus: 3%
3. Titanium Dioxide 15nm Liquid: 25%
4. Zinc Oxide 200nm EasyDisperse: 10% (as recommended by staff)
5. Phenoxyethanol SA: 1%

Analysis:

• Texture: The inclusion of SiliSolve Plus at 3% is key to achieving the desired soft, smooth, non-sticky feel. This emulsifier is designed for creating water-in-silicone emulsions, which are known for their elegant, non-greasy skin feel, similar to what you described.
• SPF 50: Using Titanium Dioxide 15nm Liquid at 25% and Zinc Oxide 200nm EasyDisperse at 10% is a combination commonly used in physical sunscreens to achieve high SPF levels like SPF 50. The specific SPF achieved depends on the exact concentration of the active oxides in the liquid/dispersed forms, but these percentages are a good starting point for high protection. The "Liquid" and "EasyDisperse" forms are also selected to improve texture and reduce whitening compared to standard powders.
• Preservation: Phenoxyethanol SA at 1% provides necessary preservation for the formula.

Mixing Method:
The mixing method corrected by the staff is appropriate for creating this type of emulsion:

1. Combine SiliSolve Plus and Titanium Dioxide 15nm Liquid. Heat this phase to around 70°C and mix until homogeneous.
2. Heat the Water phase separately to a similar temperature (around 70°C).
3. Gradually add the heated Water phase to the heated oil/silicone phase while continuously mixing/homogenizing until all the water is incorporated and a stable emulsion forms.
4. Once the emulsion has cooled down, add the Zinc Oxide 200nm EasyDisperse and mix well to ensure it is fully dispersed.
5. Finally, add the Phenoxyethanol SA and mix until combined.

Recommendation:
Your revised formula, incorporating the staff's suggestion to use 10% Zinc Oxide 200nm EasyDisperse, is a solid foundation for a physical sunscreen aiming for SPF 50 with a smooth, non-sticky texture. The ingredients selected are appropriate for this goal. While achieving the exact texture of the original product might require minor adjustments or the addition of specific emollients or silicones, this formula and method should yield a product with a very pleasant feel.

You do not need to add or remove other ingredients from this specific sunscreen formula if your goal is purely a physical sunscreen with the desired texture and SPF. The ingredients from the original list that you removed (like Aloe Vera, Allantoin, Arbutin, Collagen, MSH White Absorb, Safe-B3, GlucoBright, Pearl Powder) are primarily for skincare benefits and are not essential for the sunscreen function or the basic texture provided by the emulsifier and UV filters. As suggested by another user, you could create a separate skincare product with those ingredients.