Tom,
All of the material shrinkage issues should already be gone
by the time you get the board. About the only thing I can
think of which may cause this is uncured material. If this
shrinkage is happening with all of the product, you may want
to submit an unassembled sample to a lab (Delsen, Trace
come to mind) and have them check the Tg (glass transition
temp.) of the board to see if it's fully cured.
Ron

##############################################################
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 Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################