APPLICATIONS: These substances are primarily utilized as hardening agents for various applications, such as high-grade polished plastic and plastic ornaments, epoxy coatings for ship paint, heavy anti-corrosion paint, and other industrial building paint. Additionally, they are used as hardeners for composite materials such as wind blades, wind mold material, and rubber rollers. Furthermore, they can act as amine chain extenders or additives for polyurethane and sprayed polyurea elastomers. Lastly, they find use in the synthesis of highly transparent nylon, polyimide, and polyaspartic ester.