Increasing PA Value and Addressing White Cast in Tris-Biphenyl Triazine Sunscreen Formula
คำถาม
Regarding the provided sample sunscreen formula using Tris-Biphenyl Triazine (Nano) for SPF 30, PA+++:
Sample Sunscreen Formula:
- Tris-Biphenyl Triazine (Nano): 10%
- Light Cream Maker: 1%
- Mild Preserved Eco (Preservative): 1%
- Water: Remaining portion
Mixing Procedure: Mix 1 with 4, stir or blend until homogeneous. Add 2, stir or blend until a thick cream texture is achieved. Add 3, stir or blend until well combined.
I have two questions about this formula:
- To increase the PA value to ++++ or higher, what ingredient should be added, and at what percentage? I am interested in adding
Zinc Oxide 35nm Liquidand prefer liquid ingredients that can be mixed by hand. - Will this formula, especially with the addition of
Zinc Oxide 35nm Liquid, leave a white cast on the face? I want a formula that is colorless when applied.
คำตอบ
Increasing PA Value and White Cast in Sunscreen Formula
Based on the provided formula using Tris-Biphenyl Triazine (Nano), here's how to address your questions:
1. Increasing PA Value to ++++
To increase the PA value (UVA protection) of your formula, adding a UVA-blocking ingredient is necessary. Zinc Oxide is an excellent choice for this, as it provides strong UVA protection. Specifically, adding Zinc Oxide 35nm Liquid is suitable for your formula and can be mixed by hand.
- Recommended Addition: You can add Zinc Oxide 35nm Liquid to your formula. The product description indicates a usage rate of 5-40%. Starting with a lower percentage within this range and adjusting as needed is advisable.
- Mixing: As a liquid dispersion, Zinc Oxide 35nm Liquid is designed to be easily mixed into formulations.
- Note: Achieving a specific PA++++ rating requires laboratory testing of the final formula. Adding Zinc Oxide 35nm Liquid will significantly boost the UVA protection, likely increasing the PA rating.
Combining Tris-Biphenyl Triazine (Nano), which primarily covers UVB and UVA I/II, with Zinc Oxide 35nm Liquid, which provides strong UVA protection, will result in broad-spectrum protection.
2. White Cast
The original formula uses Tris-Biphenyl Triazine (Nano), which is a chemical sunscreen and typically does not leave a white cast on the skin.
Regarding the addition of Zinc Oxide 35nm Liquid, the product description specifically states that this type of nano-particle liquid Zinc Oxide does not cause whiteness on the skin. Therefore, adding it to your formula should not result in a noticeable white cast.
Your formula, even with the addition of Zinc Oxide 35nm Liquid, should be relatively colorless and not leave a white appearance when applied.
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Zinc Oxide 35nm Liquid
