The following files show the two sides of a PCB in a professional weather station. This shows four dark areas which the manufacturer has ascribed to water penetration. These are centred on a hole. The whole thing seems funny to me, as it has happened on only a few of the holes. I understand that it was housed in a water-tight case, not very far from the Pacific coast. I was not able to ascertain the laminate type, but it would not surpise me if it were paper based (FR3?). Has anyone seen anything like this? Brian http://www.realweatherstation.com/FILES/DSCN9441.JPG http://www.realweatherstation.com/FILES/DSCN9440.JPG --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 -----------------------------------------------------