Mike,
My first reaction is to suggest you check to see that you really have a
silver surface finish.  XRF or Auger depth profiling can identify the
surface finish and how thick it is.  I'd also do Don's suggestion to
check for discoloration and dullness.
 

Regards, 
George 

George M. Wenger (908)-546-4531 [log in to unmask] 
Celiant Corporation 
40 Technology Drive 
Warren, New Jersey 07059 

-----Original Message-----
From: Don Vischulis [mailto:[log in to unmask]]
Sent: Thursday, December 13, 2001 3:19 PM
To: [log in to unmask]
Subject: Re: [TN] Solderability of Organic Silver PCB's



Mike:
 
I don't believe the laminate will affect the solderability of the board.
The only time I've encountered solderability problems with a silver
finish was when a subcontractor forgot to turn the rinse water on while
processing boards through the silver line.  Is there any discoloration
or dullness of the silver that might indicate contamination or oxidation
of the pads?  Have you performed solderability testing on the boards?
If Dave Hillman is out there, he might want to comment on the ability of
SERA or other methods to evaluate the surface finish.
 
Regards,
Don Vischulis
 
 Hi all,
 
I am currently having a few problems with soldering an Organic Silver
finished PCB.  The PCB is a Rodgers material, but I have no information
on the exact type.  I am using Multicore X33-12i no-clean flux, but this
appears to have no effect on the pads.  All of the joints are partial,
and have very poor wetting, if any!!  Has anyone had similar problems to
this???  Any suggestions on how to fix this??  Unfortunately I can't use
a clean flux as I don't have the facility to clean PCB's.
 
Cheers
 
Mike