Optical Brightener Masterbatch is an additive used in plastics manufacturing to enhance the brightness and whiteness of plastic products, particularly those made from polymers such as polyethylene (PE), polypropylene (PP), or polystyrene (PS). This is commonly used in applications where the aesthetic appeal of the plastic is important, such as in packaging, textiles, consumer goods, and household products. It typically consists of a fluorescent whitening agent dispersed in a carrier resin, such as polyethylene or polypropylene. Optical Brightener Masterbatch is a type of organic compound that absorbs UV radiation from sunlight or artificial light sources and emits blue light, which counteracts the natural yellowing or dulling of the plastic.