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The shortcomings of convention aluminum electrolytic capacitors are discussed, in particular their lack of stability and limited temperature range. A new type of aluminum electrolytic capacitor is described of high stability and an operating temperature range from -55°C to +125°C. It owes its superior performance characteristics to the development of a new electrolyte system representing a complete departure from the customary glycol/borate electrolytes. Typically, the impedance increases by a factor of about 1.2 when going from +25°C to -55°C and extended life and shelf tests at 125°C show an exceptional stability of the electrical parameters comparable with or surpassing those of tantalum foil capacitors.