CAS 4065-45-6
AAKO name AakoSun BP4
EINECS 223-772-2

Product description

AakoSun BP4 is better known as Benzophenone-4. It is an organic, water-soluble sun filter that is mainly used as an UV-A filter. When combined with other sunscreens like AakoSun OCR, AakoSun HMS, AakoSun EHS or AakoSun OMC it also provides effective UV-B protection.

Approved for the use in sun care preparations in many countries worldwide.

  • In America and Canada max. 10% and in Europe max. 5%.

Benzophenone-4 is also known under the names Sulisobenzone and 1-phenol-4-sulfonic acid.



  • When combined with an oil-soluble UV absorber, it enables formulations with very high Sun Protection Factor (SPF).
  • Prevents natural- and synthetic hair dyes from fading in the sun.
  • Stabilizes fragrances and active ingredients against degradation or oxidation.
  • Decreases the light sensitivity of wool and pesticides.
  • Instead of penetrating the skin to a large degree, Benzophenone-4 enhances the ability of other ingredients to penetrate.


Chemical structure

Chemical structure Benzophenone-4


Packaging & storage

AakoSun BP4 is available in the following packaging type:

  • Drum fibre box of 25 kg.

Must been stored in closed container in dry, cool conditions. Has a minimum shelf life of 3 years under appropriate conditions of storage.



  • Bath products
  • Cosmetics
  • Fragrance
  • Hair care
  • Skin care
  • Sunscreens