Potassium phenylbenzimidazole sulfonates (inci)

Author:Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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CAS number: 158099-19-5

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DefinitionThis section has been translated automatically.

"Potassium' means the element potassium, 'phenylbenzimidazole sulphonates' a salt/ester of phenylbenzimidazole sulphonic acid, in this case the potassium salt of the organic acid.

Potassium phenylbenzimidazole sulfonates are used in cosmetic formulations. The compound acts as a UV absorber (protects the cosmetic against UV radiation) and UV filter (filters certain UV rays from sunlight).

Note(s)This section has been translated automatically.

The framework conditions for UV filters that may be used in cosmetics are defined in the EC Cosmetics Regulation (1223/2009) Annex VI. Phenylbenzimidazolesulfonic acid (international non-proprietary name Ensulizol) is a UV filter which has been on the market since 1934.

Due to its low solubility it has to be neutralized with a strong base like sodium hydroxide or potassium hydroxide. The sunscreen index as triethanolamine salt is 8.2. Phenylbenzimidazolesulfonic acid is approved according to the German Cosmetic Decree up to a maximum concentration of 8 % (calculated as acid).

Authors

Last updated on: 29.10.2020

Author: Prof. Dr. med. Peter Altmeyer