Phenylbenzimidazole Sulfonic Acid
⚠ EU RestrictedIdentification
CAS Number 27503-81-7
EINECS / EC 248-502-0
CosIng Ref 36535
Chemical Name 2-phenyl-3H-benzimidazole-5-sulfonic acid
IUPAC Name —
Formula C13H10N2O3S
Mol. Weight 274.3 g/mol
InChIKey UVCJGUGAGLDPAA-UHFFFAOYSA-N
Function & Classification
Primary Function UV Filter
Secondary Functions UV ABSORBER; UV FILTER
Category UV Filters
EU Regulatory Status
Max Leave-on 8%
Max Rinse-off 8%
Restrictions Max 8%
Conditions of Use Max 8% (as acid) in sunscreen products. pH adjusted.
Safety Profile
2 / 10
Comedogenic Rating: 0/5
Will not clog pores — safe for acne-prone skin
Skin Type Compatibility
Acne-Prone ✓ Safe
Fungal Acne Safe ✓ Safe
No toxicology data available yet for this ingredient.
Check SCCS opinions or CIR reports for published safety assessments.
NOAEL · Dermal Absorption % · Sensitization
Formulation Guidelines
Benefits Water-soluble UVB protection
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Documents