Nonadecylbenzene is primarily used as an intermediate in the synthesis of surfactants and detergents. Its long alkyl chain makes it suitable for applications in the production of lubricants and additives, where it enhances viscosity and stability. Additionally, it serves as a raw material in the manufacture of specialty chemicals, including emulsifiers and dispersants, which are essential in industries like coatings, textiles, and personal care products. Its hydrophobic nature also makes it useful in formulations requiring water resistance or barrier properties.