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. >>> ________________________________ >>> This message and any attachments are solely for the use of the >>> addressee and may contain L-3 proprietary information that may also >>> be defined as >> USG >>> export controlled technical data. 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