N-Phenyl-p-phenylenediamine is primarily used as an antioxidant and antiozonant in the rubber industry. It helps to extend the lifespan of rubber products by protecting them from degradation caused by oxygen and ozone exposure. This chemical is commonly added to tires, belts, hoses, and other rubber components to enhance their durability and performance under harsh environmental conditions. Additionally, it finds application in the production of dyes and pigments, where it serves as an intermediate in synthesizing various colorants. Its stabilizing properties also make it useful in certain industrial lubricants and coatings, where it prevents oxidation and maintains product integrity over time.