Phenylbenzimidazole sulfonic acid

Phenylbenzimidazole sulfonic acid
File:Phenylbenzimidazole sulfonic acid.png
IUPAC name 2-Phenyl-3H-benzimidazole-5-sulfonic acid
style="background: #F8EABA; text-align: center;" colspan="2" | Identifiers
CAS number	27503-81-7 Y
PubChem	33919
SMILES
style="background: #F8EABA; text-align: center;" colspan="2" | Properties
Molecular formula	C13H10N2O3S
Molar mass	274.30 g/mol
style="background: #F8EABA; text-align: center;" colspan="2" | Hazards
MSDS	Cole Parmer Material Safety Data Sheet
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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. 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  and Mexoryl . 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. The free acid is poorly soluble in water, so it is only used as its soluble salts.

External links

• Thomson MICROMEDEX - Sunscreen Agents (Topical)