Separator for aluminum electrolytic capacitors and aluminum electrolytic capacitors

A separator for an aluminum electrolytic capacitor interposed between a pair of electrodes， having a porosity of 65 to 85%， an average pore diameter of 0.5 to 25.0 ??m， and a clock strength of 1 to 10 cm 3 / 100. In addition， the separator is a nonwoven fabric having such a constitution， and contains polyamide fibers. In addition， by using the separator in a solid electrolytic capacitor and a hybrid electrolytic capacitor， it is possible to reduce the initial ESR and short-circuit defect rate， and to improve the reliability that can endure long-term use under severe environments. Further， the separator can be used for an aluminum electrolytic capacitor in which a conductive polymer is used as a negative electrode material. A separator for aluminum electrolytic capacitors， which is interposed between a pair of electrodes， and which has a porosity of 65-85%， an average pore diameter of 0.5-25.0 μm and a Clark stiffness of 1-10 cm3/100. In addition， this separator is composed of a nonwoven fabric which has these features， while containing polyamide fibers. By using this separator in a solid electrolytic capacitor or in a hybrid electrolytic capacitor， the initial ESR and short circuit failure ratio are able to be reduced， while enabling improvement of reliability that is good enough for use in a harsh environment over a long period of time. In addition， this separator is able to be used in an aluminum electrolytic capacitor which uses a conductive polymer as a negative electrode material. A separator for aluminum electrolytic capacitors， which is interposed between a pair of electrodes， and which has a porosity of 65-85%， an average pore diameter of 0.5-25.0 μm and a Clark stiffness of 1-10 cm 3/100. In addition， this separator is composed of a nonwoven fabric which has these features， while containing polyamide fibers. By using this separator in a solid electrolytic capacitor or in a hybrid electrolytic capacitor， the initial ESR and short circuit failure ratio are able to be reduced， while enabling improvement of reliability that is good enough for use in a harsh environment over a long period of time. In addition， this separator is able to be used in an aluminum electrolytic capacitor which uses a conductive polymer as a negative electrode material.