LOL. No. As I stated before; once soldered, the circuit board assembly
is pretty much impervious to airborne contaminants other than those that
would attack solder, as about 99% of the IAg-finished area (SMT pads,
lands, and through-holes) is soldered during assembly. So IAg is still a
good choice for things such as digital rectal thermometers, and even
many of the other applications that I stated could possibly be a concern
in my earlier posting. The key is making sure you cover all of the
IAg-plated areas with solder and all of the vias are covered with
soldermask, and know what pads or areas will remain as exposed IAg. I
would even use it to build my newly patented Bullsh!t Detector. It
worked perfectly last night while I was watching the Democratic National
Convention but it overloaded and burnt out during Hillary's speech.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James Verrette
Sent: Wednesday, August 27, 2008 11:56 AM
To: [log in to unmask]
Subject: Re: [TN] NTC
Richard mentioned something about ImAg being used in medical devices.
For medical devices worn on the body that use ImAg finish would the FDA
require warning the user to avoid deviled eggs? Let me go ask our
regulatory manager that one...
Jim
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Tuesday, August 26, 2008 4:52 PM
To: [log in to unmask]
Subject: Re: [TN] NTC
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
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