Formulation Review

Your proposed formulation and mixing method for a silicone-based product with sun protection seems generally viable.

Here's a breakdown of the steps and considerations:

Part A Mixing

Combine the following ingredients and mix thoroughly:

• Dimethicone Light (15%)
• Titanium Dioxide (Nano) (3%)
• Zinc Oxide (Nano) (7%)
• DHHB (5%)
• Octocrylene (5%)
• Lipid Soft CC (4%)
• Beige color (2%)

Ensure that the powder ingredients (Titanium Dioxide, Zinc Oxide, and Beige color) are fully dispersed in the oil/silicone phase (Dimethicone Light, DHHB, Octocrylene, Lipid Soft CC). Proper dispersion is crucial for a smooth texture, even color, and effective sun protection.

Adding Part B

Gradually add the Silicone Gel thick (qs to 100%) to the mixture from Part A. Mix until a homogeneous gel texture is achieved. The Silicone Gel acts as a thickener and provides a smooth feel. Based on your description of "thick", the Silicone Gel (Thick & Smooth, Cyclopentasiloxane Base) would be a suitable option.

Adding Part C

Finally, add the Tris-Biphenyl Triazine (Nano) (4%) to the mixture and mix until it is evenly dispersed throughout the formulation.

Summary

The proposed method of mixing the oil/silicone phase first, then incorporating the silicone gel thickener, and finally adding the remaining sunscreen agent is a logical approach for creating this type of formulation. Pay close attention to the dispersion of the powders in Part A for best results.