Nonyl Phenol Free Epoxy Curing Agent DH-3239 Hardener DH-3239 is formulated without nonyl phenol, responding to tightening environmental regulations in coating markets worldwide. Despite the clean formulation, it retains all the practical benefits of a modified cycloaliphatic amine: low viscosity, fast hardness build and excellent gloss. Manufacturers can upgrade their systems without compromising performance. Product Specifications Property Unit Value Model - DH-3239 Color -