Benzophenone-3
CAS No.
Synonyms
Molecular formula
Molecular weight
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Chemical Product Description & Applications
Benzophenone-3, also known as oxybenzone, is an oil-soluble organic ultraviolet absorber supplied as a pale crystalline powder. It absorbs UVB and part of the UVA range and dissipates absorbed energy through non-radiative processes. In cosmetic formulation it can contribute to the UV-filter system and help protect light-sensitive formulation components from ultraviolet exposure.
The powder is incorporated through a compatible oil or solvent phase rather than dissolved directly in water. Solubility in the selected vehicle controls whether it remains uniformly distributed or recrystallizes during cooling and storage. Benzophenone-3 is one component of a complete UV-protection system; the finished formulation establishes the absorption profile and measured sun-protection performance.
Typical Applications
- Oil-phase UV-filter systems: Used in sunscreen lotions and creams as part of a combination of ultraviolet absorbers. The dissolved ingredient contributes UV absorption within the emulsion film, alongside filters selected to complete the required spectral coverage.
- Protection of light-sensitive formulations: Used as a formulation UV absorber in compatible cosmetic systems containing ingredients prone to light-induced change. It reduces the ultraviolet energy reaching susceptible components inside the product.
Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Appearance | Pale yellow crystalline powder | Visual inspection |
| Identification | Consistent with authenticated reference | FTIR fingerprint comparison |
| Assay | ≥99.0% w/w | Calibrated HPLC-UV |
| Melting range | 62-65 C | Capillary melting method |
| Water | ≤0.50% w/w | Karl Fischer titration |
| UV identity | Spectrum matches authenticated BP-3 standard | UV-visible scan in ethanol |
Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.
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