Description:Water-soluble UVA andUVB 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 isopropyl alcohol. Due to its high acidity (pH < 2.5 in a 1%solution), a neutralizing agent (e.g. triethanolamine) must be added to elevatethe pH to >3.5. Yellow to beige powder.
INCI Name: Benzophenone-4
Properties: Water-soluble UVA & UVB filter. Used primrily as UVAfilter. 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 skinto a large degree, but enhances the ability of other ingredients to penetrate.Helps to stabilize UV sensitive formulations such as hair dyes, hair sprays andcolor enhanced formulations. It can offer protection of colorants againstfading 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, variouscosmetics & fragrances for product protection.