N-Nitrosodiphenylamine is primarily used as a chemical intermediate in the production of rubber accelerators and antioxidants. It plays a significant role in the vulcanization process of rubber, enhancing its durability and resistance to wear and tear. Additionally, it is employed in the synthesis of dyes and pigments, contributing to the coloration of various materials. In research, it is utilized as a model compound to study nitrosamine chemistry and its implications in carcinogenicity. Its application in industrial processes underscores its importance in material science and chemical manufacturing.