N-Phenylethylenediamine is widely used in the dye industry as an intermediate for the synthesis of various dyes and pigments. It plays a crucial role in producing hair dyes, where it acts as a primary component in oxidative dye formulations, helping to achieve long-lasting and vibrant color results. Additionally, it is employed in the production of rubber chemicals, where it serves as an antioxidant and antiozonant, enhancing the durability and performance of rubber products. In the field of organic synthesis, it is utilized as a building block for creating complex molecules, particularly in pharmaceuticals and agrochemicals. Its applications also extend to corrosion inhibitors, where it helps protect metal surfaces from degradation in industrial settings.