Reuven,
Can you tell us the difference between dendrites and whiskers? 

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From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven ROKAH
Sent: Tuesday, September 12, 2006 7:04 AM
To: [log in to unmask]
Subject: Re: [TN] PbCO3

Hi Ingemar,

1.    Are you sure its Lead (Pb) Wishers? pls inform how?

2.    Dendrites is another phenomenon than whiskers.

3.    Can you repeat with this kind of failure? ("whiskers?").


Best  Regards

Reuven  ROKAH

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             "Ingemar
             Hernefjord
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                                       Re: [TN] PbCO3

             12/09/2006 12:56


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Klein Wassink mentiones a little about Tin Whiskers (dendrites).
One guy here at our company has written a paper about Tin whiskers.
NASA have a lot about Tin whiskers. Et cetera.
But few have anything about Lead whiskers.
Only thread I have is one picture from Klein Wassink. That picture is
like a copy of our own photos.

Question is if anyone of you have any idea about the following:

A. Can Lead whiskers grow through Humiseal acrylic? I've heard that Tin
whiskers can.
B. Can alcalic saponifier cleaning of BGA high lead balls start whisker
formation?
C. Do Lead whiskers burn off easily like Tin whiskers, or are they
"stronger" ?
D. What can the reason be that the Lead whiskers grow only around the
ball's "equator" ?
E. The CBGA platform is said to come from IBM. Do they differ from
others on ball making?

These questions may not be suitable for this forum, but I make a try,
well knowing that many of you are extremly experienced.

Thx in advance

Ingemar Hernefjord
Now SAAB Microwave Systems

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