Diethylenetriamine (DETA)

Diethylenetriamine (DETA) is a low-molecular-weight aliphatic polyamine containing three amine groups (two primary and one secondary), giving it a high amine hydrogen equivalent weight (AHEW) of approximately 20.7 g/eq. DETA is one of the most reactive epoxy curing agents available, enabling room-temperature cure with excellent through-cure depth in filled and unfilled epoxy systems. Its high functionality results in dense crosslink networks with high hardness, good chemical resistance, and favorable mechanical properties. DETA is widely used in industrial coatings, civil engineering epoxy mortars, concrete primers, and composite tooling applications. However, its high reactivity translates to short pot lives (30–60 minutes at 25°C for standard epoxy systems), and its low molecular weight makes it a skin sensitizer and corrosive material, requiring appropriate PPE. The typical stoichiometric ratio is approximately 11–12 parts DETA per 100 parts of standard bisphenol A epoxy resin (EEW ~190). DETA-cured systems exhibit good adhesion to glass fiber, carbon fiber, and metals, making it a cost-effective base hardener for industrial and construction epoxy applications.