It is reported on chemical modification of epoxy resins in order to enhance electricaldc-conductivity from 10−18 S/cm to 10−13 S/cm. Two methods of solution have been committed. The first method is based on semiconducting organic model substances having chemical structure similar to bisphenol A based epoxy resins. Substituting the hardener partially by pyromelitic acid anhydride (PMDA) and applyingβ-Al2O3 as dehydration catalyst and as lean material a resin with modified connection structure was synthesized. In this way the conductivity attained the wanted level but reproducibility was unsufficient. In the second method of modification the surface of the lean material α-A2O3 was coated by tetracyanoethylene (TCNE) to form a charge transfer complex before it was incorporated into the epoxy resin. An essential enhancement of conductivity was only obtained for temperatures > 60 °C. It is probably that the Al2O3 content (66 wt.-%) is not yet sufficient to enable charge carrier transport throughout the whole sample, because the grains of lean material have no sufficient contact with one another.