Basic Info:

  • Chemical Synonym(s): SYNSORB; 2,4-dihydroxyphenyl phenylmethanone; Uf 1; UV-0; (2,4-Dihydroxyphenyl)(phenyl)methanone; Expand
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  • CAS Number: 131-56-6
  • Chemical Formula:


  • MSDS: Download


Boiling Point
194ºC (1 mmHg)
Melting Point
Flash Point
Refractive Index
Water Solubility
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Benzophenone-1, also commonly called BP-1, is used as a photoinitiator in a UV-curable system. It is a white, crystalline, flaky crystal.

It is insoluble in water but soluble in ethanol and chloroform. It has a sweet smell and is lightly scented with rose.

It is non-toxic and non-irritating to human skin. However, it is essential to avoid eye contact with this product as it may cause eye damage.

The reaction comprises benzoyl chloride, benzene and aluminum chloride, and the final product is fractionated to obtain Benzophenone-1. It is easy to decompose under light, so it needs to be stored away from light and in a cool place


Benzophenone-1 is a versatile chemical capable of initiating many types of polymerizations, including acrylics, vinyl acetates, styrene acrylates, epoxy resins, and unsaturated polyester resins.

In addition, Benzophenone-1 provides stabilizers, sensitizers, chelating agents, and thermal stabilizers.

It is a widely used UV light absorber in personal care products such as sunscreens, facial moisturizers, foundations, and lip glosses. In addition to personal care products, Benzophenone-1 is also added to some paints to prevent the color from changing in the sun.

Furthermore, BP-1 is being studied for use in various products, including adhesives, antifreeze, and flame retardants. It can also use it to make antihistamines, hypnotics and insecticides.

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