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  (Redirected from Phenylbenzimidazole sulfonic acid)
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Skeletal formula
Space-filling model
IUPAC name
2-Phenyl-3H-benzimidazole-5-sulfonic acid
3D model (JSmol)
ECHA InfoCard 100.044.078
Molar mass 274.29 g·mol−1
Safety data sheet Cole Parmer Material Safety Data Sheet
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Ensulizole (INN;[1] also known as phenylbenzimidazole sulfonic acid) 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. Ensulizole 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.[2] 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 a UV absorber of the Tinosorb or Mexoryl types. Because ensulizole 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.[3] The free acid is poorly soluble in water, so it is only used as its soluble salts.[4]


  1. ^ "International non-proprietary name". Medinet. Retrieved 6 May 2016.
  2. ^ http://www.uspdqi.org/pubs/monographs/sunscreen_agents.pdf[permanent dead link]
  3. ^ eMedicine - Sunscreens and Photoprotection : Article by Stanley B Levy
  4. ^ http://www.merck.de/servlet/PB/menu/1254590/index.html

External links[edit]