TC -K518 is a food grade liquid resin manufactured from bisphenol-A and epichlorohydin. It is recognized as a standard from which many variations have been developed. A wide variety of curing agents is available to cure liquid epoxy resins at ambient conditions. The most frequently used are aliphatic polyamines, polyamides, amidoamines, cycloaliphatic amines and modeified versions of these curing agents.