It is best to use this process to avoid additional testing costs associated with using a non-UL approved coating or application process. Although these coatings can provide significant reductions in Immunity and Emission noise, they truly are a headache for safety approvals when regarding creepage, clearance, and insulation requirements. Not so much a concern for Class III products. I would only suggest using these coatings as a last resort. They also add a great deal to the cost of your product too.
Regards, Alex McKinney Safety Engineer LXE, Inc. Tel: 770-447-4224 x3606 Fax: 770-447-6928 -----Original Message----- From: Darrell Locke [mailto:[email protected]] Sent: Friday, January 11, 2002 1:52 PM To: 'Aschenberg, Mat' Cc: [email protected] Subject: RE: Spray-on Conductive Coatings Thanks Matt, I was not aware that a UL approved painter/applicator was required. Is this in a standard, or is it just a common practice? Darrell Locke -----Original Message----- From: Aschenberg, Mat [mailto:[email protected]] Sent: Friday, January 11, 2002 10:34 AM To: Darrell Locke Cc: [email protected] Subject: RE: Spray-on Conductive Coatings Darrell, I have used this process in the past. It presents a bit of a safety nightmare. The products I work on are UL tested and approved. Getting a product approved with UL having a spray-on conductive coating is difficult. The spray needs to be UL listed for use with the particular plastic you are going to use. Then you need to find a UL approved Painter (applicator) who uses the UL approved process to apply the spray-on conductive coating. Once is enough. I stay away from those like a plague. Mat > -----Original Message----- > From: Darrell Locke [SMTP:[email protected]] > Sent: Friday, January 11, 2002 10:24 AM > To: [email protected] > Subject: Spray-on Conductive Coatings > > > Dear Colleages, > > We have seen an issue lately with spray-on conductive coatings used on the > inside of electronic enclosures. The coating works great for EMC, but > there > seems to be a problem with adhesion and tiny flakes of conductive material > getting in the electronics. I'm thinking that the spray-on type materials > should not be used at all. Has anyone else experienced this problem? > > Thanks > > Darrell Locke > Advanced Input Devices > Coeur d'Alene ID > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: [email protected] > Dave Heald [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > No longer online until our new server is brought online and the old > messages are imported into the new server. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
