Phenylbenzimidazole sulfonic acid

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Phenylbenzimidazole sulfonic acid
Skeletal formula
Space-filling model
CAS number 27503-81-7 YesY
PubChem 33919
ChemSpider 31267 YesY
KEGG D10005 YesY
Jmol-3D images Image 1
Molecular formula C13H10N2O3S
Molar mass 274.30 g/mol
MSDS Cole Parmer Material Safety Data Sheet
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Phenylbenzimidazole sulfonic acid (C13H10N2O3S) is a common sunscreen agent. In 1999, the United States Food and Drug Administration regulated that the name ensulizole be used on sunscreen labels in the United States. Phenylbenzimidazole sulfonic acid is primarily a UVB protecting agent providing only minimal UVA protection. The scope of UVB is 290 to 340 nanometers whereas the UVA range is 320 to 400 nanometers.[1] For better UVA protection, it must be paired with avobenzone, titanium dioxide, or zinc oxide; outside of the United States it can also be paired with Tinosorb [disambiguation needed] and Mexoryl [disambiguation needed]. Because phenylbenzimidazole sulfonic acid is water-soluble, it has the characteristic of feeling lighter on skin. As such, it is often used in sunscreen lotions or moisturizers whose aesthetic goal is a non-greasy finish.[2] The free acid is poorly soluble in water, so it is only used as its soluble salts.[3]


  1. ^
  2. ^ eMedicine - Sunscreens and Photoprotection : Article by Stanley B Levy
  3. ^

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