Used primarily as a precursor in the production of phthalic anhydride, which is essential for making plastics, dyes, and resins. Also found in traditional mothballs and toilet deodorant blocks due to its strong vapor action against moths and odors, though this use has declined due to health and safety concerns. Serves as a chemical intermediate in the synthesis of certain pesticides, surfactants, and dye carriers. In industrial settings, it is used in the manufacture of carbaryl, a common insecticide. Additionally, naphthalene derivatives are involved in the production of some pharmaceuticals and synthetic tanning agents for leather processing.