Plastic brightener can improve the appearance characteristics of polyvinyl chloride products, resulting in a bright surface, excellent transparency, smooth texture, and outstanding stability for paste resins. Adding 2-5 parts of this product can achieve a brightening effect. It also serves as an excellent compatibilizer, enhancing the performance of fillers in PVC soft and semi-soft products. When used as an auxiliary plasticizer in vinyl resins, adding 8 parts of this product provides a plasticizing effect, significantly improving the electrical insulation properties and surface smoothness of the products. It is particularly effective in cable materials, especially in extrusion and calendering products, yielding items with a bright surface, good transparency, and a smooth feel. This product can also be used in heat-peelable coatings based on ethyl cellulose and cellulose acetate butyrate, as well as in dip molding and coating products.