Increasing PA Rating in Sunscreen Formulation
คำถาม
Hello. If I want to primarily use SPF Protect Ultra™ II at 15%, which according to the information provided gives approximately SPF50, PA++, how much % of Zinc Oxide 35nm Liquid should I add to achieve SPF50, PA+++ (increasing one +)? Or are there other ingredients that can help increase the + rating?
คำตอบ
Increasing PA Rating with Zinc Oxide 35nm Liquid
To increase the PA rating from PA++ to PA+++ when using SPF Protect Ultra™ II at 15%, adding Zinc Oxide 35nm Liquid is a suitable approach.
Zinc Oxide is a physical sunscreen agent that provides excellent protection against UVA rays, which are primarily responsible for the PA rating. By incorporating Zinc Oxide 35nm Liquid into your formulation alongside SPF Protect Ultra™ II, you can enhance the UVA protection and potentially achieve a higher PA level.
Suggested Usage
Zinc Oxide 35nm Liquid can be used at a typical rate of 5-40% in formulations. To reach PA+++, you would need to add a sufficient amount to boost the UVA protection provided by SPF Protect Ultra™ II.
It is recommended to start with a percentage within this range and adjust based on desired performance. Keep in mind that achieving a specific PA+++ rating often requires laboratory testing of the final formulation.
For broad-spectrum protection covering both UVA and UVB wavelengths effectively, it is generally recommended to use Zinc Oxide in combination with Titanium Dioxide.
By adding Zinc Oxide 35nm Liquid and potentially adjusting the concentration, you can work towards increasing the PA rating of your sunscreen formulation.
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Zinc Oxide 35nm Liquid
