Used primarily as a chemical intermediate in organic synthesis, particularly in the production of pharmaceuticals and specialty chemicals. It plays a role in the introduction of the chloromethyl group into various compounds, which is a key step in the synthesis of certain active pharmaceutical ingredients. Additionally, it is utilized in the manufacture of ion-exchange resins, which are essential in water purification and chemical separation processes. Due to its reactivity, it is handled with caution in industrial settings, ensuring proper safety protocols are followed.