Product Introduction:
Product Name: Phenylbenzimidazole Sulfonic Acid
Abbreviations: PBSA, Ensulizole
Synonyms: 2-Phenylbenzimidazole-5-sulfonic acid, 2-Phenyl-1H-benzimidazole-5-sulfonic acid
CAS Number: 27503-81-7
Molecular Formula: C₁₃H₁₀N₂O₃S
Molecular Weight: 274.30 g/mol
EINECS Number: 248-502-0
Phenylbenzimidazole Sulfonic Acid Chemical Structural Formula
Appearance: White crystalline powder
Odor: Characteristic odor; conforms to standard
Identification: A. IR <197k>: IR spectrum of the sample matches that of the reference standard
B. UV <197u>: Absorbance coefficient at 302 nm differs from that of the reference standard by no more than 3.0%
Specific absorbance (1%, 1 cm, 302 nm): 920 ~ 990
Assay (Titration): 98.0% ~ 102.0%
Loss on drying: 2.0% max
UV absorption curve:
Highassay’s Phenylbenzimidazole Sulfonic Acid Features:
• Highly efficient UVB absorber
• Excellent photostability; significantly boosts SPF
• Suitable for transparent water-based sunscreen products (e.g., gels or clear sprays) and water-resistant formulations
• Maximum usage levels: 4% (US, CA, AUS, KR); 8% (EU, CN); 3% (JP)
