Used primarily as an intermediate in the production of nonylphenol ethoxylates, which are nonionic surfactants found in industrial and household cleaning agents, emulsifiers, and wetting agents. Also applied in the formulation of agrochemicals, textiles, leather processing, and paints for improving dispersion and stability. Historically used in detergents and personal care products, but its use has declined due to environmental and health concerns related to endocrine disruption and persistence in ecosystems. Still found in some industrial processes where high-performance surfactants are required.