This chemical, commonly known as Fluorescent Brightener OB-1, is primarily used as an optical brightener or fluorescent whitening agent in the plastics industry. It is incorporated into thermoplastics such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and acrylonitrile-butadiene-styrene (ABS) to enhance the brightness and whiteness of finished products, making them appear more vibrant and attractive. Additionally, it is utilized in the textile industry for synthetic fibers to improve their brightness and mask natural yellowing. Its mechanism involves absorbing ultraviolet light and re-emitting it as blue light, thereby improving the aesthetic quality of materials.