Looking for a supplier

Hi,
I am researching thin film electret materials for a project in my
company. From what I have read so far there are three common
materials:Teflon, Tefzel or Mylar. Many suppliers on the web seem to be
supplying these in thin film form. However, they are not in ready to
use electret form. The buyer is expected to convert them. Where can I
get info about suppliers of these materials in ready to use electret
form?
Also are there any other easier to obtain or less expensive electret
materials?
If this is not the forum to post this query, I apologise and would
appreciate it is somebody could direct me to the appropriate forum.
thanks,
EmbNut
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