Dimethyldioctadecylammonium chloride is primarily used as a cationic surfactant and disinfectant, effectively eliminating bacteria, viruses, and fungi on surfaces, making it valuable in healthcare, sanitation, coatings, and cleaning products. In the textile industry, it serves as a fabric softener and antistatic agent, providing a smooth feel and preventing static buildup. It is employed in personal care products like hair conditioners to enhance manageability and softness. In paper manufacturing, it acts as a conditioning agent to improve strength and durability. Its antimicrobial properties are useful in water treatment to control microbial growth. In industrial settings, it functions as an emulsifier and stabilizer in various formulations.