Synthesis of bisphenol A diglycidyl ether The most common epoxy resins are based on reacting epichlorohydrin (ECH) with bisphenol A,  causing a distinct chemical compound often known as bisphenol A diglycidyl ether (normally often known as BADGE or DGEBA).Curing Time: Depending on the formulation, epoxy usually takes between a handful of several h