Optical brightening agents are micro particles added to plastic materials as a part of the plastic production process to enhance their visual quality and increase their level of brightness. These agents are designed to reflect or absorb UV lights in order to improve the visual quality of plastic materials.

Optical brightening agents come in various sizes and shapes and are composed of minerals such as TiO2, BaSO4, ZnS, and ZnSe, which are the most commonly used ones. These agents not only enhance the brightness of plastic materials, but also improve their UV resistance. This ensures that plastic materials last longer and maintain their visual quality.

The dosage of optical brightening agents may vary depending on the type of plastic material, color selection, structure, and the type of product being produced. Additionally, the use of optical brightening agents may interact with other additives present in the plastic material, making it important to determine the correct dosage.