I have built cavity type boards before; I understand the kinds of problems
you are fighting.  One thing I learned about cavity boards:  be willing to
try process steps that are "backwards" or out of order from the normal
process.  Sometimes, this is the only way to overcome some of the obstacles
you're up against.

What step in the oxide line is attacking the LPI?  You may want to skip that
tank, or perhaps reduce the dwell time, if possible.  Or, have you tried
other LPI's?  There may be another product that will be better able to
withstand the oxide chemistry.  Also, examine your LPI process; maybe there
is something you can do there (increase cure?, UV bump?) to help.  

Mark Dowding
Regional Technical Specialist
Insulectro
909-943-5758
[log in to unmask]

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact   *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask]      *
***************************************************************************