Tetraethylenepentamine (TEPA)

Tetraethylenepentamine (TEPA) is a high-functionality aliphatic polyamine with five amine groups (two primary, three secondary) providing an amine hydrogen equivalent weight (AHEW) of approximately 27 g/eq. TEPA is used as an epoxy curing agent in applications requiring high crosslink density, exceptional chemical resistance, and good performance in low-temperature environments. Its five nitrogen atoms per molecule deliver a higher density of hydrogen-bonding sites and potential crosslink points compared to DETA or TETA, resulting in cured networks with high hardness and excellent solvent and acid resistance. TEPA is particularly valued as a raw material for producing high-performance amine adducts and Mannich base hardeners, where it contributes functionality and reactivity to the adduct backbone. In direct use, it cures standard BPA epoxy systems at room temperature with moderate pot life. Dosage is approximately 14–15 phr for standard epoxy resins. TEPA's viscosity is slightly higher than DETA or TETA but still manageable. Skin sensitization and corrosivity require standard amine handling precautions.