One of the more durable I had used in the notebook industry was an Enthone coating, Nickel over Copper. While the shielding effectiveness claims were rather good from most conductive coating vendors, the actual application would never achieve close to the claim. The issue being that a conductive coated sample clamped to an opening in a screen room per the shielding effectiveness specifications really wasn't representative of a typical housing with all its nooks and crannys and lack of curvature between surfaces. Add a few openings and mating surfaces that cannot be coated for aesthetic reasons and you can easily see why you will never approach even close to the claimed shielding effectivenss. Ease of application and the durability (lack of flaking/corrosion) will be the main points that affect your choice of product. Though I don't have data on it, I would bet that in a typical notebook housing that you would see a difference between coated and not coated but the differences between types of conductive coatings would be close to indistinguishable for the most part from an emissions standpoint. Earl
_____ From: [email protected] [mailto:[email protected]] On Behalf Of John Kretsch Sent: Thursday, April 27, 2006 11:03 PM To: [email protected] Subject: Conductive Paint Provide Decent Shielding Effectiveness? This topic has come up regarding painting the inside of a plastic housing with something like Electrodag550 http://www.achesonindustries.com/doc/pds/Electrodag550.pdf It claims 60 dB (frequency range is not specified) with a 0.002 minimum application thickness. Does anyone have any experience with this? Any long term durability issues? Regards, John R. Kretsch, P.E., NCE Principal Interpro Consulting Engineering, LLC (860) 919-2980 http://www.ip-ce.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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 [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
