Epoxy hardener HW-3609 is an aliphatic polyamine Mann ich base curing agent designed for use with liquid epoxy r esin. It is of low viscosity, moisture-tolerant, and reactive at low temperatures ( -5℃ ). HW-3609 will react with liquid epoxy resins at low temperatures and high humidity to produce a chemical-resistant surface coating. The physical and chemical properties . Appearance Yellow liquid Viscosity ( BH model CPS /25℃ ) 200 - 400 Amine value (mgKOH/g) 3 00 -400 Color (