Yes, whiskers in both nostrils SIMULTANEOUSLY:.
On 18 June 2013 14:29, Whittaker, Dewey (EHCOE) <
[log in to unmask]> wrote:
> Schrodinger's?
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
> Sent: Tuesday, June 18, 2013 2:12 PM
> To: [log in to unmask]
> Subject: Re: [TN] APEX Papers on Conformal coat and tin whiskers
>
> I am glad the whiskers in my nose isn't Tin. Imagine they grow and grow,
> and one day you look like a cat.
>
> Inge
>
>
> On 18 June 2013 12:00, Steven Creswick <[log in to unmask]> wrote:
>
> > Dewey
> >
> > Is this an e-mail link to a group or something?
> >
> > Steve C
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
> > (EHCOE)
> > Sent: Tuesday, June 18, 2013 12:57 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] APEX Papers on Conformal coat and tin whiskers
> >
> > Also try [log in to unmask]
> > 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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> > >> recipient, any
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> > >>> Please
> > >> notify
> > >>> the sender by reply e-mail and immediately delete this message and
> > >>> any attachments.
> > >>>
> > >>>
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