HMDA, or hexamethylenediamine, is a chemical compound used in a variety of industrial applications. It is primarily used as a building block in the production of nylon-6,6, a synthetic polymer that is used in a wide range of products such as textiles, carpets, and automotive parts. In addition to its use in the production of nylon, HMDA is also used as a curing agent in epoxy resins, as a corrosion inhibitor in water treatment, and as a crosslinking agent in adhesives and coatings. It is also used as a hardener in some types of polyurethane resins. HMDA is typically produced by reacting adiponitrile with ammonia in the presence of a catalyst. The resulting product is then purified and distilled to remove impurities. HMDA is a highly reactive compound and must be handled with care to avoid skin and eye irritation.