Phenylbenzimidazole Sulfonic Acid (PBSA) is a water-soluble organic UVB filter. It works by absorbing UVB radiation and converting it into low-energy heat, helping protect the skin from sunburn and UV-induced damage, while being suitable for lightweight and high-pH sunscreen formulations.

Used in daily wear and light sunscreens. 
Provides a light, nongreasy feel. 
Water-soluble UVB filter.