Light yellow to yellowish-brown polyamide curing agent HW-501 suitable for bonding of various substratess Polyamide Epoxy Resin HW-501 is a yellowish to yellowish brown viscous liquid reactive polyamide resin, obtained by the reaction of fatty acids with polyamines. Designed for use in two component epoxy adhesives. Performance: High viscosity, high activity; Good adhesion; Good chemical resistance and corrosion resistance; 1.The physical and chemical properties Appearance