Benzophenone-4 is a water soluble broad UV-filter.It has worldwide approval for skin protection and it is widely used in sun preparations.It can also offer protections of colorants against fading and help stabilize fragrances and active ingredients against oxidation.
Benzophenone-4 is approved world,the maximum concentration in ready for use preparation various according to local legislation.
The sulfonic acid group makes Benzophenone-4 soluble in water,these acid group must be neutralized with one of the usual neutralizing agents,e.g.Na OH.The yellow color of benzopheonone-4 is intensified bu neutralization,this may change the coloration of the solution.
It should be noted that Benzophenone-4 is not compatible with magnesium salts.
The expert Panel released the final report on the safety assessment f Benzophenone-1,-3,-4,-5,-9 and -11
( December 18,1981) stating that these ingredients were safe as used in cosmetic product.
A CIR ( cosmetic ingredients review) report is available.