Whiskers can be produced by several different types of alloys, including lead, silver, tin, and zinc. The most common (in electronics) are tin and zinc.
The whiskers typically take on characteristics of the metal they are borne from. For example, zinc and tin whiskers are usually straight, brittle, and break easily. Tin whiskers are shiny and do not usually branch out, but zinc whiskers often produce many branches and are black or dark gray in color. Lead whiskers, on the other hand, are curly, soft, malleable, and are fragile but can withstand some bending forces before they break.
Our Technet friend Ingemar Hernefjord once posted some incredible lead whisker photos, I believe they are in Steve Gregory's website. I think this is one of them. http://stevezeva.homestead.com/files/daniel121b.jpg
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of harvey
Sent: Monday, January 23, 2012 10:36 AM
To: [log in to unmask]
Subject: Re: [TN] Finally, the folly of lead-free solder is making the big time
Thanks.
Tin, wherever used, may form whiskers.
The list of sources would include tin plating anywhere, lead free solder, and 63-37 solder.
But I believe that lead deters whisker formation in eutectic solder generally.
That is a statement that is supported by empirical history and much more.
I'm copying Carol Handwerker for her opinion on the subject.
--- On Mon, 1/23/12, Julie Silk <[log in to unmask]> wrote:
From: Julie Silk <[log in to unmask]>
Subject: Re: [TN] Finally, the folly of lead-free solder is making the big time
To: [log in to unmask]
Date: Monday, January 23, 2012, 8:10 AM
These weren't soldered with lead-free
solder. It was tin-lead. The problem was tin-plated parts or boards (maybe both?).
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