Thanks Steve, Here's some extra info about the picture: Before my destructive experiments with removing the coverlayer (always a pleasure! ) this discoloration showed through as dark spots, some about 1 cm diameter. The material still looked flat, unlike most delaminations that I've seen, and that's why I'm not sure if this really is a delamination. After cutting the flex with scissors I found out that at these spots there is very bad adhesion between copperplane and coverlayer. Although the copper has a greenish color, it looks smooth and shiny. This was already somewhat visible before assembly, but it became worse during reflow soldering. Daan >>> <[log in to unmask]> 07/30 3:32 pm >>> Hi Everyone! Still hot as Hades, here...looks like we're looking at +100-degree days all this week! They did an interesting thing on one of the local news station here to illustrate how hot it gets inside a car, and why it's really crazy to leave kids or pets inside cars when it gets this hot...they actually baked cookies inside a car!!! Enough of that... Daan's asked me to post a picture for him up on our web site. Go to: http://stevezeva.homestead.com/index.html I've got a picture of a flex-rigid board with a greenish spot on the copperplane, under the coverlayer. I would like to know what this is, and if it we should reject it or not. Daan Terstegge SMT Centre Thales Communications Unclassified mail Personal Website: http://www.smtinfo.net --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 --------------------------------------------------------------------------------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------