Harry,
        your explanation was almost 100% bang on, however your one comment
below could use some clarification. When soldered with Tin-Lead solder, the
gold is completely and almost instantly dissolved into the solder leaving
only nickel for the solder joint to adhere to. Therefore there is no "soft
all-gold underlying".

Sincerely,
Brad Velander.

Lead PCB Designer
Norsat International Inc.
Microwave Products
Tel   (604) 292-9089 (direct line)
Fax  (604) 292-9010
email: [EMAIL PROTECTED]
http://www.norsat.com

Visit us at Booth 2G2-09 at CommunicAsia 2002 in Singapore June 18-21.


> -----Original Message-----
> From: Harry Selfridge [mailto:[EMAIL PROTECTED]]
> Sent: Monday, April 22, 2002 10:35 PM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Gold - good or evil?
> 
<SNIP> 
>  When you have a brittle alloy over a soft all-gold 
> underlying 
> layer, naturally something is going to give under stress.
<SNIP> 

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