Re: gEDA-user: Tin pest

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

On Wed, Feb 01, 2006 at 11:13:22AM -0800, David Griffith wrote:
> 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?

If the water in the pipes freezes, the pipes burst anyway.

Read the pdfs - they state it there.

CL<