From: look165@numericable.fr   
      
   Basically a parasistic parallel resistance that drive some current   
   inside the cap.   
   For electrolytics, there are ionic recombination too.   
   Also thermal shocks can affect the auto-discharge rate.   
   For electrolytics,, those parameters merely affect the nominal value.   
   The tolerance (+/10...20%) has no relation with auto-decharge.   
      
   The more you put caps in //, the more you put these resistor in // and   
   the less the resulting value is and ESR  to   
   With caps in series, it is the opposite.   
      
   I think tantalum ones are the worst.   
   And as already written above, mica and plastic films the best, and of   
   course, air ones for low values.   
   Oil and glass caps are rather good too but uncommon (UHT voltages).   
   The auto-healing once "holed" lower their // resistance.   
      
   The main drama is that electrons love protons  and protons love   
   electrons and the // resistance is a matrimonial agency !   
   In any case, they try to jump over  the gap between the electrodes !   
      
   The ideal cap, though unreal, is the vacuum cap.   
      
   AK a écrit le 18/05/2019 à 18:52 :   
   > I am trying to find info about what a low leakage capacitor is.   
   >   
   > I read that aluminum electrolytic caps have a higher leakage rate than most   
   other types.   
   >   
   > How do you determine if a capacitor is low leakage?   
   >   
   > I was looking at this one.   
   >   
   > 0.1µF 250 Volt 10% Metallized Film Capacitor Axial   
   > Specifications   
   >   
   >      Capacitance: 100000 pF / 100 nF / 0.1µF   
   >      Voltage rating: 250 VDC   
   >      Tolerance: ±10%   
   >      Size: 14mm x 8.5mm x 4.5mm (W x H x D)   
   >      Axial leads   
      
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