Epoxy resins are generally refers to molecules containing two or more epoxy groups of organic polymers, except for a few, but they are not high relative molecular mass. The molecular structure of the epoxy resin is a molecular chain containing reactive epoxy groups characterized by the epoxy group at the ends of the molecular chain or a cyclic structure in the middle. Since the molecular structure of the epoxy group-containing reactive group, so that they can react with a crosslinking curing agent, and various types of formation of insoluble, infusible polymer having a three-to mesh structure.

Where the molecular structure of the polymer compound having an epoxy group is collectively referred to as epoxy resin. After curing the epoxy resin has excellent physical and chemical properties, it has the surface of the metallic and non-metallic materials having excellent adhesive strength, good dielectric properties, variable setting shrinkage, good dimensional stability, high hardness, flexibility good, stable alkali and most solvents, which are widely used in various sectors of national defense, economy, for pouring, dipping, laminating materials, adhesives, coatings and other uses.