Jason,

I've been through a similar situation before. If you have to keep the OSP
finish, try reflowing your boards in a Nitrogen atmosphere this will help
the degradation of the OSP. Then keep the time between reflow and wave
solder to a minimum.

Martin
===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
12/16/99 12:49 pm
>I am having problems with wave soldering OSP boards.  After the boards have seen
>a heat cycle (reflow), they are impossible to get hole fill on topside without
>first cleaning the boards to remove either oxidation or hardened OSP.  I don't
>know which one I have because I haven't had them analyzed yet.  The flux used to
>wave solder the boards is a very weak customer dictated rosin no clean flux.
>The OSP is Cu106A.  I am not familiar with OSPs.  They won't do HASL either.
>Any insight?  Suggestions?  Assistance?
>
>As it stands now, the process is to flux with high solids water soluble/heat to
>clean the board-->wash off flux-->immediately wave solder with rosin containing
>no clean.  This is not a production process........
>
>Jason Smith
>Process Materials Engineer
>Lexmark Electronics
>
>##############################################################
>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
>##############################################################

##############################################################
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
##############################################################