Synthesis of bisphenol A diglycidyl ether The most common epoxy resins are dependant on reacting epichlorohydrin (ECH) with bisphenol A,  causing another chemical material called bisphenol A diglycidyl ether (usually known as BADGE or DGEBA). Epoxy resins are polymeric or semi-polymeric components or an oligomer, and as such not often exist a