Phenalkamine Hardener DH-7003 Solvent-free epoxy curing agent · 200 kg drum 7003 modified phenalkamine, solvent-free curing agent intended for use as a low-temperature curing agent for liquid epoxy resin. It provides rapid curing under adverse conditions of high humidity and low temperature, together with yellowing resistance and excellent performance under high-humidity conditions. Cardanol based phenalkamine chemistry allows a fast cure at 5 °C even when relative humidity