The long answer is: don't do it... it grow furs if you are un-lucky...
very hairy... now you wait for the response of Dewey (he is killing
himself not to respond)...

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Friday, June 13, 2008 12:52 PM
To: [log in to unmask]
Subject: Re: [TN] NTC - Tin Whiskers - how long? Size matters!

I must have annoyed him, Brian is being short with me.  

Actually though, I am really surprised Dewey has let this one go.
That's really big of him. 


regards,
 - Graham

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joe Fjelstad
Sent: Friday, June 13, 2008 1:21 PM
To: [log in to unmask]
Subject: Re: [TN] Tin Whiskers - how long? Size matters!

:-)
 
 
In a message dated 6/12/2008 10:53:45 P.M. Pacific Daylight Time,
[log in to unmask] writes:

The  short answer: long enough to give a short answer.

Brian

Graham  Collins wrote:
> Good day TechNet
> A tin whisker question.   
> 
> If (hypothetically, as this thankfully hasn't been built  yet) a pure 
> tin
finish part is used, what sort of length whisker could  happen?
> 
> What we are looking at is this: a part we want to use  is only 
> available
with a pure tin finish on copper.  Matte tin, not  bright.  So if we use
it, and a tin whisker grows, how long might it  grow?  If the part is
(for example) 10mm away from adjacent parts, and a  realistic maximum
whisker length is less than that, it obviously mitigates  (YES, but does
not entirely remove) the risk.
> 
> The only value  I've seen is in a Dave Hillman/Doug Pauls presentation

> from
Apex 05, wherein  it is stated that they "can be 9.5mm long".  Dave /
Doug, any  comment on this?  Can you cite a source?  Does matte vs
bright tin  make a difference?
> 
> regards,
>  
> Graham  Collins
> Halifax Production Engineering
> (902) 873-2000 ext.  6215
> 
> 
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