Used primarily as an intermediate in the production of other chemicals, especially in the synthesis of refrigerants and fluorocarbons. It serves as a chlorinating agent in organic reactions and is employed in the manufacture of pesticides and pharmaceuticals. Historically used in military applications as a component of smoke screens due to its ability to generate dense white smoke when combined with zinc oxide. Also utilized in the formulation of degassing agents for aluminum casting, where it helps remove impurities from molten metal. Its use has declined due to environmental and health concerns related to its toxicity and persistence.