Re: gEDA-user: Tin pest

[David Griffith <dgriffi@xxxxxxxxxxxxx>]

On Wed, 1 Feb 2006, Karel Kulhavy wrote:

> The scientific papers state that silver prevents pest very little and
> doesn't prevent in the low percentages that are present in tin/silver
> solder. Why do you assert tin/silver is not susceptible to tin pest?

I was under the impression that about 2% of some other metal (silver,
lead, bismuth, or antimony) will prevent tin pest as well as tin whisker
and that the 60/40 ratio was for eutectic purposes.  Yesterday I perused
the plumbing solders at the hardware store. All were 2/98 silver-tin.  If
there was a danger of tin pest with this ratio, wouldn't there be more
stories of disasterous leaks in new building construction after the first
freeze?


-- 
David Griffith
dgriffi@xxxxxxxxxxxxx