1,4-Diaminobutane dihydrochloride is widely used in biochemical research as a precursor for synthesizing polyamines, which play critical roles in cell growth and differentiation. It is also employed in the production of nylon polymers, enhancing their strength and durability. In pharmaceutical applications, it serves as an intermediate in the synthesis of various drugs, including those targeting cancer and infectious diseases. Additionally, it is utilized in the preparation of ion exchange resins, which are essential for water purification and chemical separation processes. Its role in organic synthesis further extends to creating specialty chemicals and coatings.