Used primarily as a fumigant and pesticide in agriculture, it helps control pests and insects that damage crops. In the metal industry, it serves as a degassing agent to remove impurities from molten metals, particularly aluminum and magnesium alloys. It is also employed in the production of explosives and pyrotechnics due to its ability to release chlorine gas when heated. Additionally, it has been utilized in veterinary medicine as an anthelmintic to treat parasitic worm infections in livestock. However, its use has declined due to environmental and health concerns related to its toxicity and persistence in the environment.