----- Original Message -----
From: "Reuven ROKAH" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, September 12, 2006 2:04 PM
Subject: Re: [TN] PbCO3


> Hi Ingemar,
>
> 1.    Are you sure its Lead (Pb) Wishers? pls inform how?
You can see the pictures, these are whiskers, for sure, classical form.
>
> 2.    Dendrites is another phenomenon than whiskers.
Yes, dendrites use to look like some fractal things, or feathers or leaves
>
> 3.    Can you repeat with this kind of failure? ("whiskers?").
You mean provoke by means of environmental tests? No, we have not yet. The
owner is sparse
with the CBGAs, special ASICs, worth a fortune each.

J Brusse (NASA), are you still there, I've lost your adress. Offline.
>
>
> Best  Regards
>
> Reuven  ROKAH
>
> e mail: [log in to unmask]
>
>
>
>             "Ingemar
>             Hernefjord
>             (KC/EMW)"                                                  To
>             <ingemar.hernefjo         [log in to unmask]
>             [log in to unmask]>                                           cc
>             Sent by: TechNet
>             <[log in to unmask]>                                     Subject
>                                       Re: [TN] PbCO3
>
>             12/09/2006 12:56
>
>
>             Please respond to
>              TechNet E-Mail
>                   Forum
>             <[log in to unmask]>
>             ; Please respond
>                    to
>                 "Ingemar
>                Hernefjord
>                 (KC/EMW)"
>             <ingemar.hernefjo
>             [log in to unmask]>
>
>
>
>
>
>
>
> 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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