you have anticipated the answers and elimintated them in your details, then
finished with the conclusion.
plastics have a nasty mechanical 'skin effect' that requires in all cases I've
chased, a mechanical process to remove the 'skin' and expose the conductivity.
Even tried some experiments at home and found that carbon fiber as a filler can
accumulate a large potential that discharges to those that dare expose that
potential. ps. use small samples unlike what I attempted.
From: Ken Javor ken.ja...@emccompliance.com
To: EMC-PSTC@LISTSERV.IEEE.ORG
Sent: Thursday, June 27, 2013 12:07 AM
Subject: Conductive plastic
Forum members:
Am looking for a conductive plastic of such composition that the
conductivity is uniform throughout the material, as opposed to a
non-conductive exterior surrounding an inner core of dispersed conductive
materials. Neither am I looking for some sort of deposited layer of
conductive material.
Many years ago, 3M demonstrated such a material at a few EMC Symposia. The
demo consisted of a small plastic box with a lid that was large enough to
fully contain a chattering relay. With the chattering relay in the box minus
the lid and near a small AM radio, it tore up AM reception, but gently
putting the lid on it (no fasteners per my recollection) was enough to kill
the interference completely.
My recollection is that 3M did not go into production with that material,
else I would be looking for it there.
The need is for a small conductive enclosure for harsh environments where a
layer of deposited conductive material is undesirable. Further, I do not
want a manufacturing process that requires laborious removal of the outer
insulating material where the sides of the box overlap and need to make a
conductive seam.
I am willing to give up quite a bit of conductivity relative to a deposited
layer of metal or metallic coating in order to get this magical homogenously
conductive material.
Any one know of anything like this, or is it unobtainium?
Thank you,
Ken Javor
Phone: (256) 650-5261
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