β-Naphthylamine is primarily used in the production of azo dyes, which are widely applied in the textile industry for coloring fabrics. It serves as an intermediate in synthesizing these dyes, contributing to vibrant and long-lasting colors. Additionally, it has been utilized in the manufacture of certain rubber chemicals and antioxidants, which help enhance the durability and performance of rubber products. However, due to its carcinogenic properties, its use is strictly regulated, and safer alternatives are often sought in industrial applications.