How do I find capacitors for low dielectric absorption?
Dielectric absorption in high K ceramic makes them poor for S&amp;H caps.  

Electrolytics all have this property but worse.  Teflon is the closest to ideal cap  with the lowest Dielectric Absorption.  Followed by Polypropylene and NPO Ceramic.


The error above is plotted for a 1V step signal into a S&amp;H.

The above was reported by RAP in ED magazine but written in 1982.  I have known this since the late 70's from Mil-Std Hdbk's on Capacitor material properties and had worked with long RC integrators and fast ADC S&amp;H's. 

If you need small tolerances use NPO ceramic. If you need better performance than above, negative feedback circuits exist to compensate for this property.