And speaking of expelling noxious fumes...
Consider the level of fumes expelled by a human body, if you rode a bicycle from SF to LA via Hyway 1?   In my younger day, I used to consider this a wonder vacation...   I believe the expression that applies here is "No Brain = No Pain".

Rudy Sedlak


--- On Tue, 8/26/08, Bev Christian <[log in to unmask]> wrote:

> From: Bev Christian <[log in to unmask]>
> Subject: Re: [TN] NTC
> To: [log in to unmask]
> Date: Tuesday, August 26, 2008, 1:52 PM
> Paul,
> Actually people expel hydrogen sulfide, not sulfur dioxide.
> I read it in
> a book about the subject written by a medical doctor. I
> regaled Doug
> Pauls and Dave Hillman with hilarious trivia from the book
> as we drove
> down highway one from SF to LA.
> 
> At room temperature I would expect no reaction between
> methane and
> silver. I am not so sure about possible reactions at
> elevated
> temperatures. I am not a catalyst chemist.
> Bev
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul
> Reid
> Sent: Tuesday, August 26, 2008 3:02 PM
> To: [log in to unmask]
> Subject: [TN]
> 
> Remembering the Guys from Myth Busters, key note speakers
> at IPC
> LA...are those flatulent people who express sulfur dioxide
> in their
> gaseous eruptions (from eating deviled eggs) belonging to
> the order of
> the red flame or the order of the blue flame?
> 
> I believe, that day in LA, that Bev enlightened us as to
> the major
> component of the gases expressed by flatulent new born
> babies (H2). How
> he would know such a thing was never explained however.
> 
> Paul Reid
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas
> O. Pauls
> Sent: Tuesday, August 26, 2008 2:23 PM
> To: [log in to unmask]
> Subject: [TN]
> 
> Well, I guess that depends on what the previous meal was. 
> I don't know
> if methane has the same harmful effect on immersion silver
> as sulfur.  I
> suppose I could go knock back a dozen or so deviled eggs
> and let you
> know......
> 
> And Dewey, that was a horrid pun, even for you.  Well done.
> 
> Doug Pauls
> 
> 
> 
> 
> Inge <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 08/26/2008 10:12 PM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please
> respond to Inge
> <[log in to unmask]>
> 
> 
> To
> [log in to unmask]
> cc
> 
> Subject
> [TN]
> 
> 
> 
> 
> 
> 
> So a TV living with a gaseous family is at risk?
> Inge
> 
> 
> ----- Original Message -----
> From: "Woolley, Mark D. (Mark)"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, August 26, 2008 7:37 AM
> Subject: [TN]
> 
> 
> Any environment that contains sulfur, like hydrogen sulfide
> or sulfur
> dioxide should preclude the use of IAg.  The sulfur will
> react with the
> silver and "grow" sulfides which can be
> electrically conductive
> resulting is shorts between vias.  This can occur even when
> the
> concentrations are within OSHA limits for human exposure.
> Silver sulfides can be semiconductors or conductors
> depending on the
> chemical composition.  They are black in color instead of
> silver, any
> exposed silver will be affected.
> 
> Mark Woolley
> Failure Analyst
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of James
> Verrette
> Sent: Tuesday, August 26, 2008 8:25 AM
> To: [log in to unmask]
> Subject: [TN]
> 
> What characteristics of the end use environment would cause
> IAg to not
> be an appropriate finish and why?
> 
> Jim Verrette
> Senior Electrical Engineer
> 
> ------------------------------
> 
> Date: Mon, 25 Aug 2008 08:24:35 -0500
> 
> From: "Stadem, Richard D."
> <[log in to unmask]>
> 
> Subject: Re: ENIG White paper
> 
> Dave,
> 
> You write as if you are not at all familiar with IAg, which
> is totally
> 
> understandable. However, IAg has been around in full
> production mode for
> 
> many years now, and is rapidly becoming the most-used
> finish in the
> 
> market. Do not confuse it with immersion tin finish, which
> has little or
> 
> no shelf life.
> 
> IAg-finished circuit boards have a recommended shelf or
> storage life of
> 
> about 1 year. However, if packaged properly in a
> hermetically sealed bag
> 
> with silver saver paper liners, and stored away from
> sulfates, it is
> 
> possible to use boards up to 5 years old or even longer
> with no issues
> 
> whatsoever. All you need to do is call out the packaging on
> the
> 
> fabrication drawing per IPC 4553.
> 
> I have soldered IAg boards that sat around exposed to the
> elements for
> 
> more than 4 years in previous lives, and they soldered up
> just fine, no
> 
> change in the DPMO.
> 
> Some of the bare boards we use here at GD are 34" by
> 40", 48 layers,
> 
> 1/2" thick, cost is about $48,000 each. Their finish
> is IAg. =20
> 
> I have had a lot of experience with IAg over the past 10
> years or so,
> 
> having seen at least 150,000 IAg boards assembled and
> soldered with
> 
> every type of component you can think of, and I have never
> experienced
> 
> any issues with them. I have experienced many, many issues
> with ENIG,
> 
> however, and that is the finish that would keep me up at
> night waiting
> 
> for the bomb to go off. There are many reliability issues
> associated
> 
> with ENIG such as black pad, brittle nickel, etc., etc, but
> just think
> 
> about the fact that you are soldering to nickel, which has
> a dissolution
> 
> rate about 50 times slower than copper.
> 
> Should you ever have a solderability issue with IAg, you
> can have the
> 
> fabricator rework the finish. If you have an issue with
> ENIG, the only
> 
> thing you can do is rework your scrap account.
> 
> However, you need to take the end-use environment into
> consideration
> 
> when you select a circuit board finish. ENIG
> (unfortunately) may be your
> 
> best choice. I would fully qualify just one assembly at a
> time, and I
> 
> would fully qualify it. For Space use, I would not suggest
> IAg.
> 
> -----Original Message-----
> 
> 
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