Synthesis of bisphenol A diglycidyl ether The commonest epoxy resins are according to reacting epichlorohydrin (ECH) with bisphenol A,  causing a distinct chemical material often known as bisphenol A diglycidyl ether (generally referred to as BADGE or DGEBA). Epoxy resins are polymeric or semi-polymeric elements or an oligomer, and as a resul