DETDA is a sterically hindered aromatic diamine whose steric hindrance makes it much less active than toluenediamine (TDA). It reacts several times faster with polyurethane prepolymers than DMTDA and about 30 times faster than MOCA. It is mainly used in RIM polyurethane system and spray polyurethane (urea) elastomer coating system. It has the advantages of fast reaction speed, short demolding time, high initial strength, hydrolysis resistance and heat resistance of products. In addition, the product can also be used as an antioxidant for elastomers, lubricants and industrial greases, as well as chemical synthesis intermediates.