Yes Inge, they are difficult to grow "on purpose" :-). I guess your field case was with electroplated, not immersion Sn.
I asked Jay Brusse a while ago if he knew confirmed cases of wiskering on ImSn and the answer was (as far as I remember) - just one in a PTH.
Regards,
Vladimir
Vladimir
SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca
-----Original Message-----
From: Inge <[log in to unmask]>
Date: Wed, 24 Mar 2010 15:32:36
To: <[log in to unmask]>
Subject: Re: [TN] Tin Whiskers
I add this : we have tried to grow Tin whiskers on pure Tin objects and also
on Immersion Tin without success. Tried biasing, cold, heat, humidity,
storage, but nothing ever happened. I've myself had a look at some objects
for years (!) but never succeeded to produce any whiskers. But I've
investigated several cases from the field. I sent one such example to NASA
from a waveguide filled with up to 10 mm long whiskers. I took a similar
waveguide and ran tests, nothing happened . Seems like they are hard to
predict. Spoky things.
Inge
--------------------------------------------------
From: "Inge" <[log in to unmask]>
Sent: den 24 March 2010 14:07
To: <[log in to unmask]>
Subject: Re: [TN] Tin Whiskers
> Hi Steve,
>
> I know you are a experienced person. How come you ask? Do I
> misunderstand something in your lines. You know well that there are
> hundreds of papers on Tin whiskers in conjunction with Immersion Tin.
>
> Jay, are you there? You are the best in the US on this topic. Can you
> open Pandora's box? I've lots of material, but as the Great King of
> Whiskers, you ought to say something.
>
> During the time waiting for Jay, you can read this one:
>
> http://www.atotech.com/fileadmin/pdf/papers/el/Immersion_tin_and_tin_whisker_growth.pdf
>
> Inge
>
>
>
>
>
>
> --------------------------------------------------
> From: "Steve Kelly" <[log in to unmask]>
> Sent: den 24 March 2010 10:30
> To: <[log in to unmask]>
> Subject: [TN] Tin Whiskers
>
>> Hi All,
>>
>> Two questions today:
>>
>> 1) Any known instances of tin whiskering when the finish is
>> Immersion Tin
>>
>> 2) Any known instances of tin whiskering after the immersion tin is
>> soldered with a RoHS compliant solder such as SAC 305.
>>
>> Thanks. Steve Kelly
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> PFC_2col.png
>>
>> CREATING A FLEXIBLE FUTURE
>>
>>
>>
>> Steve Kelly
>>
>> (416) 750-8433 (work)
>>
>> (416) 750-0016 (fax)
>>
>> (416) 577-8433 (cell)
>>
>>
>>
>>
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