[mems-talk] Polyimide and Parylene Ionic conductivity

[Michael D Martin]

We're working on a biomems application where we are relying on the high electrical resistance of polyimde in an ionic aqueous environment (1M KCl).  We have found though that the bulk resistivity of PI-2611 in this solution is only 8.3 x 10^11 Ohm-cm vs. the published value from HD Microsystems of >10^16 Ohm-cm!  We see a similar affect on parylene .  Can anyone comment? Have you seen this before? 


Thanks in advance, 
   Michael Martin 
   U. of Louisville