Conformal coating with proper cleaning helps. Moisture will migrate through the coating, so it is important to get any ionic contamination off the board before coating. Good design practices including maintaining enough spacing between conductors of different voltage potential. Potting might be something you find in under hood automotive applications, or more sever environments. Outdoor locations will typically give condensation due to the diurnal temperature cycling. Hopefully any outdoor electronics will not be directly exposed to the weather. Blair Hogg GAI-Tronics Corporation -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Reyes, Angel LAM2 4429 Sent: Friday, August 17, 2007 2:32 PM To: [log in to unmask] Subject: [TN] PCB assembly protection for outdoor working under harsh environmental conditions Could I have examples of what PCB assembly protection (perhaps conformal coating) is used for products to be used in outdoor (Stop lights, Automobile, etc) under harsh environmental conditions Angel Reyes Principal Engineer Rain Bird Corp./controls Mfg. Div 9491 Ridgehaven Ct San Diego Ca. 92123 Ph:(619) 661 4429 ******************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.Hubbell.com - Hubbell Incorporated --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------