We are a telecommunication equipment manufacturer (OEM)  and we wave solder all are boards assemblies.  On almost all our PCB Assemblies we 
used small value ( 2pF, 6.8pF, 27pF, 39pF etc...) ceramic  50volts capacitors.  When we wave our boards, we have to process our boards at a 
conveyor speed greater than 4 feet/min. with a dwell time below 2.3 seconds or we are in a lot of trouble. If we attemp to solder with a 
greater dwell time, the value of the capacitors changes sometimes by as much as 25% (  a 39pF  becomes a 30pF after wave).  We happened to 
have difficult to solder boards and it would help if we could increased the dwell time.  The solder pot temperature is at 480°F. 

Now is there someone who knows a solution to that problem or is there someome who experience the same kind of problem?

I certainly would appreciate any suggestion.


Alain MAthieu
Technical Specialist


Thanks in advance.

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