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 > >- >---------------------------------------------------------------- >This message is from the IEEE Product Safety Engineering Society emc-pstc >discussion list. To post a message to the list, send your e-mail to ><emc-p...@ieee.org> > >All emc-pstc postings are archived and searchable on the web at: >http://www.ieee-pses.org/emc-pstc.html > >Attachments are not permitted but the IEEE PSES Online Communities site at >http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used >formats), large files, etc. > >Website: http://www.ieee-pses.org/ >Instructions: http://listserv.ieee.org/request/user-guide.html >List rules: http://www.ieee-pses.org/listrules.html > >For help, send mail to the list administrators: >Scott Douglas <emcp...@radiusnorth.net> >Mike Cantwell <mcantw...@ieee.org> > >For policy questions, send mail to: >Jim Bacher: <j.bac...@ieee.org> >David Heald: <dhe...@gmail.com> > > > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@radiusnorth.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
