The main difference between aluminum electrolytic capacitors and conductive polymer capacitors is the electrolyte material. Aluminum electrolytic capacitors use a liquid electrolyte; conductive polymer capacitors use a solid conductive polymer electrolyte. The polymer composition material has extremely high conductivity which results in ripple current capability up to six times higher than aluminum capacitors, and ESR 75% lower than aluminum capacitors of the same case size. Generally, the life of aluminum electrolytic capacitors is estimated to quadruple for each 20°C decrease in operating temperature. In comparison, conductive polymer capacitors offer a longer life; for each 20°C decrease in operating temperature, the life of the polymer is estimated to be ten times longer. Conductive polymer electrolyte capacitors are also more stable at higher temperatures than aluminum capacitors.