Phenylbenzimidazole sulfonic acid

Phenylbenzimidazole sulfonic acid (CAS 27503-81-7), commonly abbreviated as PBSA, is a water-soluble UV filter used primarily in sun care and personal care formulations.

Where is Phenylbenzimidazole sulfonic acid used?

• Sunscreens: regulated UVB-filtering active in lotions, sprays and gels needing water-phase UV protection
• Pharmaceutical topicals: photostabilization of light-sensitive actives
• Daily moisturizers and after-sun products
• Combination UV filter systems: water solubility complements oil-phase UVA absorbers for full-spectrum coverage
• Its water solubility makes it suitable for aqueous and hydrophilic systems.

Good to know: Unlike oil-soluble UV absorbers, its water solubility makes it suitable for aqueous and hydrophilic systems.

Commercial specifications

• Purity typically 98% or higher
• Compliance with EU Cosmetics Regulation and equivalent international standards
• Tested against USP and Ph. Eur. standards