27503-81-7

Name 2-Phenylbenzimidazole-5-sulfonic acid
CAS 27503-81-7
EINECS(EC#) 248-502-0
Molecular Formula C13H10N2O3S
MDL Number MFCD00053007
Molecular Weight 274.3
MOL File 27503-81-7.mol
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Chemical Properties

Appearance white fine crystalline powder
Melting point  >300 °C (lit.)
density  1.3592 (rough estimate)
refractive index  1.6360 (estimate)
storage temp.  2-8°C
solubility  ethanol and water: soluble ((as sodium salt))
form  Fine Crystalline Powder
pka -0.87±0.40(Predicted)
color  White
Water Solubility  soluble
Merck  3593
BRN  922664
Stability: Hygroscopic
Major Application cleaning products
cosmetics
environmental
food and beverages
personal care
Cosmetics Ingredients Functions UV FILTER
LIGHT STABILIZER
UV ABSORBER
InChI 1S/C13H10N2O3S/c16-19(17,18)10-6-7-11-12(8-10)15-13(14-11)9-4-2-1-3-5-9/h1-8H,(H,14,15)(H,16,17,18)
InChIKey UVCJGUGAGLDPAA-UHFFFAOYSA-N
SMILES OS(=O)(=O)c1ccc2[nH]c(nc2c1)-c3ccccc3
LogP -1.42 at 25℃
Uses
phenylbenzimidazole sulfonic acid (2-phenyl-5-benzimidazolesulfonic acid; 2-phenylbenzimidazole-5-sulfonic acid, ensulizole) is one of 21 FDA-approved sunscreen chemicals for uVB absorption. It has an approved usage level of up to 4 percent in the united States and up to 8 percent in the european union. When combined with a proper base, it becomes a water-soluble sunscreen. It exhibits a very effective use level versus SPF relationship when compared to other sunscreen chemicals. In addition, when combined with other uVB absorbers, it seems to significantly boost SPF. It can also help protect a product from deterioration when exposed to uV light. Also considered excellent for use in clear sunscreen gels.
CAS DataBase Reference 27503-81-7(CAS DataBase Reference)
EPA Substance Registry System 27503-81-7(EPA Substance)
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Safety Data

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H315-H319-H335
Precautionary statements  P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313-P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  Xi,C
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
WGK Germany  3
TSCA  Yes
REACH Registrations Active
HS Code  29339990
Storage Class 11 - Combustible Solids

Hazard Information

Material Safety Data Sheet(MSDS)

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