Juliano,

Great information on Tin and other metallic whiskers can be found at 
http://nepp.nasa.gov/whisker/ .    From what I have seen and read they 
were a known phenomenon in the early days of radio, lead was alloyed to 
the tin to reduce whiskering.  I have observed whiskers that looked like 
white mold growing on tin plated components, the largest I had captured 
is 3/8" long and about 36 ga in diameter, easily seen with the naked 
eye.

Had instances of the whiskers catastrophically destroying components as 
well.


Pat Goodyear,
Retired nuclear control technician
Pacific Gas and Electric


On Mon, Jun 2, 2014 at 7:04 AM, Datacom - Juliano Ribeiro wrote:

> Dears,
>
> Why occurs the Tin Whisker? Is it possible tin whiskers occurs in both
> process (Lead Free and Tin Lead process)?
>
>
> Thank you
>
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> Juliano Bettim Ribeiro
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