Phenylbenzimidazole Sulfonic Acid

Phenylbenzimidazole Sulfonic Acid

  • INCI Name:         Phenylbenzimidazole Sulfonic Acid
  • Chemical Name: 2-Phenyl-1H-benzimidazole-5-sulphonic acid
  • CAS No:              27503-81-7

What is Phenylbenzimidazole Sulfonic Acid?
It is also known under the names Ensulizole.It is a water-soluble chemical sunscree, absorbs mostly UVB and a small fraction of UVA wavelengths.The texture is clean and not greasy.

Features of Phenylbenzimidazole Sulfonic Acid

  • Long-lasting protection. It can convert ingested ultraviolet radiation into less harmful infrared radiation and heat. Its protection and quality from sunlight does not decrease over time, so it can somewhat mitigate the breakdown of other UVB isolators in sunscreen.
  • Strong UVB absorber. Phenylbenzimidazole sulfonic acid is often used as a common active ingredient in all sunscreen products. It is very effective when it comes to protecting the skin from the harmful effects of the sun’s UVB rays. In case of UVA protection, it should be kept in mind that the compound is not that efficient as a shield.
    To make sure that Phenylbenzimidazole sulfonic acid has the capability to protect an individual from both the UVA and UVB rays of the sun, it needs to be paired with titanium dioxide, avobenzone or a similar compound like zinc oxide.
  • Water soluble. It means that cosmetic products that have it as an active ingredient feels light to the skin post application. When used in the manufacturing of lotions, sunscreens and moisturizers, it is often seen that patrons prefer products containing Phenylbenzimidazole sulfonic acid due to its non-greasy and light finish.

In short, it is one of the best protective compounds for human skin against UV radiation.

Uses & Applications

Personal care

  • Widely used as UV filters in sunscreens and cosmetics to prevent sunburn and skin damage, or as stabilizers to prevent photodegradation in many commercial products.
  • Finds application in formulating sun-, baby- & daily skin care products and decorative cosmetics with sun protection.
  • Added to packaging and some consumer products, such as cosmetics and paints, to protect the products from sun damage.

Product Details






Colorless or off-white powder



Loss on drying

2.0 Max

Specific extinction (E1%, 1cm at 302+2nm)


Shelf Life

24 months

Download Data Sheet

Technical Data Sheet –Phenylbenzimidazole Sulfonic Acid

Material Safety Data Sheet– Phenylbenzimidazole Sulfonic Acid

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