Sunscreen Formula SPF 50 PA++ (Water-Resistant, Non-Greasy)

Based on your request for a sunscreen formula with SPF 50 PA++, water resistance, and a non-greasy feel, we recommend considering formulations using Titanium Dioxide 15nm Liquid.

This ingredient is a physical sunscreen that provides protection against both UVA and UVB rays. It is designed for use in water-in-oil emulsions, which are known for their water-resistant properties. The liquid form is easy to incorporate into formulas and is described as lightweight and non-oily, helping to achieve a non-greasy feel, especially when combined with ingredients like Cyclomethicone.

Here is an example formula using Titanium Dioxide 15nm Liquid that achieved SPF 51.06, PA++:

• Water: 64%
• Cyclomethicone: 10%
• Titanium Dioxide 15nm Liquid: 25%
• Mild Preserved Eco: 1%

Procedure:

1. Mix Cyclomethicone and Titanium Dioxide 15nm Liquid together and heat to 70°C, stirring until combined.
2. Heat the Water phase to 60-70°C.
3. While blending the oil phase continuously, gradually add the Water phase.
4. Add Mild Preserved Eco and blend until fully incorporated.

This formula utilizes Cyclomethicone, a silicone, which contributes to a lightweight and non-greasy texture. The water-in-oil emulsion system provides water resistance.

For broader spectrum protection covering all UVA/UVB wavelengths, it is recommended to use Titanium Dioxide in conjunction with Zinc Oxide 35nm Liquid.

Another option for achieving high SPF is SPF Protect Ultra™ II, which can also provide high sun protection efficiency with a light feel. However, the Titanium Dioxide 15nm Liquid formula is particularly well-suited for achieving water resistance and a non-greasy texture as requested.