Hexane-1,6-diamine dihydroiodide is primarily used in organic synthesis and chemical research. It serves as a precursor or intermediate in the production of various polymers, particularly polyamides like nylon. The compound is also utilized in the preparation of coordination complexes and as a reagent in the synthesis of other organic compounds. In biochemical studies, it can be employed to modify or crosslink biomolecules, aiding in the study of protein structures and interactions. Additionally, it finds application in the development of materials with specific mechanical and thermal properties, contributing to advancements in material science.