Hello,

All of the board houses that I have talked to and that are capable of both processes 
always recommend silver immersion.  Any board house can describe both of these 
processes, pros and cons, more efficient than I can.

Here is what I can recall.
1)
Silver is natural to the solder process of assembly, gold is not.  Gold plating 
requires another metal.  I seem to recall the nickel lowers the temperature to an 
acceptable level required to solder a component to, but I could be way off on that 
last statement.
2)
All plating tarnishes.  HASL, Silver and even Gold.  ALL metal oxidizes.
3)
A PCB will oxidize if exposed to air.
4)
A silver immersed board can repeat the plating process up to five times.

Cheers!
Drew


----- Original Message ----- 
From: "Wayne Bickers" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Monday, April 22, 2002 6:50 PM
Subject: [PEDA] Gold or silver plating


> Sorry this is a little off topic but you guys are the ones who will know.
> 
> I have 3 issues, 
> 
> 1) I require a smooth finish, hence gold or silver plating/ flashing
> 2) I need the PCB's to last in stores for a period of time, for arguements
> sake call it 1 year without oxidising 
> 3) I need to have some pads hand soldered and require a good wetting effect
> (spreading of the solder when applied)
> 
> I would appreciate it if anyone out there has tried both and could indicate
> which may be the better finishing material to use.
> 
> 
> thanks 
> 
> Wayne Bickers
> Electronics Engineer
> Tru-Test Ltd
> 

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