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Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Tuesday, June 18, 2013 9:50 AM
To: [log in to unmask]
Subject: Re: [TN] APEX Papers on Conformal coat and tin whiskers
John Barnes is the person collecting the bibliography (> 20,000 citations)
* Bibliography for Tin Whiskers, Zinc Whiskers, Cadmium Whiskers, and
Other Conductive Metal Whiskers
http://www.dbicorporation.com/whiskbib.htm
Bob Landman
On Jun 18, 2013, at 5:52 AM, Steven Creswick <[log in to unmask]> wrote:
> Inge,
>
> Sorry, but was not me. I can imagine there being a great deal of
> non-published work out there, however.
>
> Smooth skies!
>
> Steve C
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
> Sent: Tuesday, June 18, 2013 1:27 AM
> To: [log in to unmask]
> Subject: Re: [TN] APEX Papers on Conformal coat and tin whiskers
>
> FYI
>
> Someone (Trikeman?) told me that about 10,000 papers exist about whiskers.
> Of course most of them are echoes.
>
> Inge
>
>
> On 12 June 2013 07:26, greg <[log in to unmask]> wrote:
>
>> There have been several papers published at APEX on the topic. But
>> whether they address the specific issues raised today I leave to
>> wiser heads than mine.
>>
>> APEX 2007:
>>
>> Effect of Conformal Coating on Tin Whisker Growth, Vijay Kumar and
>> Linda Woody, Lockheed Martin
>>
>> Parylene as a Suppressant for Tin Whiskers Growth on Printed Circuit
>> Boards, Rakesh Kumar Specialty Coating Systems
>>
>> Whisker Penetration into Conformal Coating, Stephen McKeown, Joseph
>> Kane, Dr. Stephan Meschter BAE Systems, Johnson City, NY
>>
>>
>> APEX 2008:
>>
>> Effects of Tin Mitigation Processes on Whisker Growth and Solder
>> Joint Reliability for Chip and Small-Outline Package Components, Tom
>> Lesniewski and Tom Higley, Northrop Grumman Network Communications,
>> San Diego, CA 92128
>>
>> APEX 2010:
>>
>> Conformal Coatings for Tin Whisker Risk Management, William Fox and
>> Linda Woody Lockheed Martin Missiles and Fire Control, Ocala, Florida
>>
>>
>> And Chris Hunt did publish also but the APEX papers of his do not
>> talk about conformal coating. (He may have published somewhere else
>> on whiskers/coatings. Dave who published on tin coated braided wire
>> may want to weigh in after he returns.)
>>
>> Having done the file search on the above whiskers/coatings APEX
>> papers and read their summaries the answer to "Does it help?" seems
>> (to me) to be somewhere between "yes/no/maybe/it depends." (i.e. it's
>> "above my pay
>> grade.")
>>
>> Greg Munie
>> IPC Director of Design Programs
>>
>>
>>> -------Original Message-------
>>> From: Mike Fenner <[log in to unmask]>
>>> To: [log in to unmask]
>>> Subject: Re: [TN] minimum thickness of Type UR Conformal coat and
>>> tin
>> whiskers
>>> Sent: 12 Jun '13 09:07
>>>
>>> Richard, slightly tongue in cheek I ask: How does soldering with
>> tin/lead
>>> prevent tin finish on PCB whiskering?
>>>
>>> Phil I recall Chris Hunt of NPL in UK did some work on this. You can
>>> probably download a copy of paper from their WWW.
>>>
>>> Best Wishes
>>>
>>>
>>>
>>> Mike
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
>>> Sent: Wednesday, June 12, 2013 2:22 PM
>>> To: [log in to unmask]
>>> Subject: Re: [TN] minimum thickness of Type UR Conformal coat and
>>> tin whiskers
>>>
>>> Not only can the whiskers grow through the conformal coating, they
>>> can
>> grow
>>> under it like weeds in a stream. NASA has some good pictures of this
>>> on their website.
>>> The best tin whisker mitigation scheme is called tin/lead solder.
>>>
>>> -----Original Message-----
>>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
>>> Sent: Wednesday, June 12, 2013 8:10 AM
>>> To: [log in to unmask]
>>> Subject: Re: [TN] minimum thickness of Type UR Conformal coat and
>>> tin whiskers
>>>
>>> Phil,
>>> While this is an answer I "should" know, I don't. Dave Hillman
>> regularly
>>> attends and presents at the CALCE yearly conference on whiskers and
>>> so
>> he
>>> keeps up on all of that. At present, my esteemed colleague is
>>> bumping
>> his
>>> head on rocks, kayaking upside down, on some white water in North
>> Carolina.
>>> He should be back in the office on Monday and will no doubt answer
> then.
>>>
>>> From our discussions, the general rule is still "no conformal
>>> coating prevents whiskers". A thicker coating may cause the
>>> whisker to expend
>> more
>>> energy punching through and yet more energy to punch through an
>>> adjacent coating on a lead (usually resulting in buckling), but I
>>> have yet to
>> hear
>>> about some magic thickness of any kind of coating that completely
>> mitigates
>>> whiskers. But I could be wrong.
>>>
>>> Dave?
>>>
>>> Doug Pauls
>>>
>>>
>>>
>>> From: Phil Bavaro <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Date: 06/11/2013 02:26 PM
>>> Subject: [TN] minimum thickness of Type UR Conformal coat and
> tin
>>> whiskers
>>> Sent by: TechNet <[log in to unmask]>
>>>
>>>
>>>
>>> Doug et al,
>>>
>>> Is there a disagreement in the industry as to what minimum thickness
>>> of urethane is required in order to mitigate tin whisker
> concerns?
>>>
>>> I am hearing that the .003+/-.002" does not provide enough of a minimum
>>> thickness and that the number is as high as .004". I can understand
>>> wanting the minimum being raised to .002" but higher than that would
>> seem to
>>> make the process much more difficult to control.
>>>
>>> I have a potential customer asking if we measure the thickness on
>>> the individual component leads which is another can of worms it
>>> seems. We always used flat samples to document our thicknesses.
>>>
>>> I did not get to attend this years APEX so I might have missed the
>> latest
>>> data.
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