ESCA is a few atom deep surface analysis tool that is useful for detecting
trace contamination which can adversely affect adhesion.  The contamination
sensitivity is somewhat limited at 0.1% but it is a strictly SURFACE
analysis as opposed to extraction contamination techniques such as hot
liquid extraction ion chromatography.  If you don't have ESCA equipment, I
am sure there are commercial analytical labs which provide the service -
the equipment and data intrepretation is not trivial.

For more ppm level detection I have been told SIMS is useful but have not
tried it yet.

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################