Description:Water-soluble UVA and UVB filter. Only short UVA (UVA-2, 290-360 nm) but not long UVA are filtered.Synonyms: Sulisobenzone, 1-phenol-4-sulfonic acid. Highly stable, does notdegrade in sunlight but protects other UV blocking agents from UV-induced degradation.Benzophenone-4 is readily soluble in water, propylene glycol, glycerine,ethanol and is opropyl alcohol. Due to its high acidity (pH < 2.5 in a 1%solution), a neutralizing agent (e.g. triethanolamine) must be added to elevate the pH to >3.5. Yellow to beige powder.
INCI Name: Benzophenone-4
Properties: Water-soluble UVA & UVB filter. Used primrily as UVA filter. To be combined with other sunscreens (e.g. octocrylene, homosalate,ethylhexyl salicylate, OM-cinnamate) for effective UVB protection. Benzophenone-4provides inadequate UVB protection when used alone. Does not penetrate the skin to a large degree, but enhances the ability of other ingredients to penetrate.Helps to stabilize UV sensitive formulations such as hair dyes, hair sprays and color enhanced formulations. It can offer protection of colorants again stfading and help stabilize fragrances and active ingredients against oxidation.
Use: Incorporate into water phase (pH 1.2-2.2). Allowed use levels:USA 10% (when used alone; 5-10% when used in combination), Brazil 10%, Japan10%, EU 5%. For external use only.
Applications: Sun care products, color cosmetics with sun protection, various cosmetics & fragrances for product protection.