Abstract: A capacitor assembly that is capable of performing well under the conditions of high humidity and temperature (e.g., 85% relative humidity/85° C.) is provided. The capacitor assembly comprises a solid electrolytic capacitor element, an anode termination that is in electrical connection with the anode body, cathode termination that is in electrical connection with the solid electrolyte, and casing material that encapsulates the capacitor element and leaves exposed at least a portion of the anode termination and the cathode termination. The casing material is formed from an epoxy composition that contains one or more inorganic oxide fillers and a resinous material that includes one or more epoxy resins crosslinked with a co-reactant, wherein inorganic oxide fillers about 75 wt. % or more of the epoxy composition, and vitreous silica constitutes about 30 wt. % or more of the total weight of inorganic oxide fillers in the epoxy composition.

Abstract: A capacitor assembly that is capable of performing well under the conditions of high humidity and temperature (e.g., 85% relative humidity/85° C.) is provided. The capacitor assembly comprises a solid electrolytic capacitor element, an anode termination that is in electrical connection with the anode body, cathode termination that is in electrical connection with the solid electrolyte, and casing material that encapsulates the capacitor element and leaves exposed at least a portion of the anode termination and the cathode termination. The casing material is formed from an epoxy composition that contains one or more inorganic oxide fillers and a resinous material that includes one or more epoxy resins crosslinked with a co-reactant, wherein inorganic oxide fillers about 75 wt. % or more of the epoxy composition, and vitreous silica constitutes about 30 wt. % or more of the total weight of inorganic oxide fillers in the epoxy composition.