An epoxy resin composition is disclosed for joining dissimilar materials. The identified epoxy resin compositions can fee used to seal metallic and non-metallic components of a capacitor. Specifically the epoxy resin composition can be applied to joints between a non-metallic capacitor bushing and a metallic tank cover and metallic terminal cap. Once the epoxy resin composition is cored, it can provide a seal that can withstand the stresses and environmental conditions to which a capacitor is subjected.