Increasing PA to PA++++ in Your Sunscreen Formula

To increase the UVA protection (PA rating) of your sunscreen formula from PA++ to PA++++ while using SPF Protect Ultra™ II, you will need to add a sunscreen ingredient that provides strong UVA protection.

While increasing the concentration of SPF Protect Ultra™ II primarily boosts the SPF value, adding a broad-spectrum UVA filter is necessary to achieve a higher PA rating.

We recommend adding Bisoctrizole (MBBT, e.q. Tinosorb M) to your formula. Bisoctrizole is a highly effective broad-spectrum UV filter that provides excellent protection against both UVA and UVB rays and is compatible with various sunscreen formulations. It is also water-dispersible, making it suitable for your emulsion type.

Here is a proposed modified formula incorporating Bisoctrizole to help achieve PA++++:

• SPF Protect Ultra™ II: 15%
• Milk Lotion Maker™: 3%
• Satin Cream Maker™: 0.7%
• Bisoctrizole (MBBT, e.q. Tinosorb M): 5%
• Water: 75.3%
• Mild Preserved Eco™ (Preservative-Free): 1%

Total: 100%

Note: The addition of Bisoctrizole at 5% is a suggested starting point to significantly increase UVA protection. To confirm the exact SPF and PA++++ rating, it is essential to perform laboratory testing on the final formula. You may need to adjust the percentage of Bisoctrizole based on testing results to achieve the desired PA++++ rating.