SPF Values for Titanium Dioxide 15nm Liquid and Zinc Oxide 35nm Liquid

Based on the information available:

• Titanium Dioxide 15nm Liquid: At a 1% concentration, this ingredient provides an approximate SPF value of 2.0.
• Zinc Oxide 35nm Liquid: At a 1% concentration, this ingredient provides an approximate SPF value of 1.0-1.5. It's important to note that Zinc Oxide is particularly effective at providing PA (UVA) protection, which is protection against longer UVA rays, more so than SPF (UVB) protection.

When combining Titanium Dioxide 15nm Liquid and Zinc Oxide 35nm Liquid, or using them with other sunscreen ingredients, the resulting SPF and PA values cannot be simply added together. This is because sunscreen ingredients can work synergistically, meaning their combined protective effect is greater than the sum of their individual effects. Therefore, calculating the exact SPF/PA of a formulation requires specific testing of the final product.