:-)
 
 
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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