They don't look bad to me. If the minimum mask thickness is met, no problem.
It looks like Vacrel, should be 2.3 mils thick, right? Even if the thin
spots are down to 1 mil, I wouldn't be concerned. I don't know about what
issues one might have in the surface mount assembly process, but assuming no
problem there, I believe no reliability issues will result from this
condition.

Timothy Reeves
QA Manager/Process Engineer
ECD Circuit Board Division


|-----Original Message-----
|From: Mike Sewell [mailto:[log in to unmask]]
|Sent: Tuesday, September 19, 2000 12:10 PM
|Subject: Wrinkles in Dry Film Mask

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8d
##############################################################
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
##############################################################