Reddish-brown clear liquid modified phenalkamine epoxy curing agent HW-690M fit for general antocorrossion Epoxy hardener 690M is a modified phenalkamine epoxy curing agent mainly produced from cardanol. It is a general type curing agent for epoxy anticorrosive system with high viscosity, eco-friendly solvent-free, good film-forming properties, excellent comprehensive and high-cost performance. Performance: Environmental-friendly solvent free, high viscosity; Good film