Phenylbenzimidazole sulfonic acid or ensulizole is a water-soluble UVB absorber that can be utilized in the water phase of emulsion systems, in contrast to most oil-soluble sunscreen ingredients, allowing for a less greasy, more aesthetically pleasing formulation such as a daily use moisturizer containing sunscreen. Phenylbenzimidazole sulfonic acid boosts the SPF of organic and inorganic sunscreens. It can also be used in clear gels owing to its water solubility.

WKSORB940 Soluble organic chemical filter. It absorbs UVB rays from about 280 to 320 nm.

WKSORB1000 Phenyl dibenzimidazole tetrasulfonate disodium is a water-soluble sunscreen that has an efficient dual sunscreen effect in the UVA range, approximately 320 to 400 nm.