Oxybenzone is typically white to pale yellow in appearance. It commonly occurs in the form of crystals or powder.
This organic compound, also known as Benzophenone-3, is widely recognized for its ability to absorb ultraviolet (UV) light, making it a common ingredient in sunscreens and other personal care products. Its characteristic color reflects its chemical structure and physical state.
Key Characteristics of Oxybenzone
Beyond its color, oxybenzone possesses several other notable physical and chemical properties. These properties are crucial for understanding its applications and behavior.
| Property | Description |
|---|---|
| Appearance | White to pale yellow crystals or powder |
| CAS Reg. No. | 131-57-7 |
| Melting Point | 65.5 ºC |
| Boiling Point | 150–160 ºC (at 5 torr) |
| Water Solubility | 13 mg/L |
Forms and Uses
Oxybenzone is synthesized as a solid, appearing either as fine powder or crystalline structures. Its pale coloration ensures it does not significantly alter the color of the products it's incorporated into, which is a desirable trait for cosmetic and pharmaceutical formulations.
Key applications include:
- Sunscreen: As a UV filter, it helps protect skin from harmful UVA and UVB rays by absorbing the radiation.
- Cosmetics: Used in various personal care products, including moisturizers, lip balms, and makeup, for their sun-protective qualities.
- Plastics: Incorporated into some plastic materials to prevent degradation and discoloration caused by UV exposure.
For more detailed information on the chemical properties and uses of oxybenzone, you can explore resources like the American Chemical Society's Molecule of the Week archive on Oxybenzone.
