Soldermasks should withstand 500 degrees F for several short cycles.
     What soldermask are you getting and how thin is it (cross section) 
     where it is coming off?


______________________________ Reply Separator _________________________________
Subject: Ass: Soldermask problem!
Author:  [log in to unmask] at corp
Date:    8/13/96 6:43 AM


     
     
We are experiencing a problem with a soldermask on a a PCB during wave   
soldering.
The mask tends to degrade during wave soldering and remove after   
cleaning.
This defect is only seen over thin copper traces (especially around vias)   
and not over
the bare PCB.
     
Can anyone tell me what is the typical temperatures a solder mask can   
withstand
during the wave soldering process (e.g. preheats, max. temp and time   
etc.)
     
Also is anyone else having this problem or can the flux or the cleaning   
process be
causing this problem.
     
Thanks in advance
     
Martin Dooner
AMT Ireland
University of Limerick
Plassey
Limerick
[log in to unmask]
     
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