Ing: With respect to dust is it primarily a question of
breakdown/penetration of the polymer? I can't now find the reference but I
am sure that I have read a study by Per-Erik Tegehall of your IVF which
showed that with dust a cause of coating failure was a conductive dust layer
ON the coating. Shouldn't be too hard for you to dig out as they are just up
the road (in global terms) from you.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Tuesday, November 27, 2007 10:03 AM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coating Breakdown and Iraqi dust
David,
Thanks for reports. I also have your book.
Now, in one of the reports (page 17)there is a test on Polyethylene and
Intercept(TM). It says, that it takes 7 days for a 1 ppm Chloride
environment to breakdown Polyethylene, while it takes 35 years for the
Intercept. In both cases the film thickness is 2 mils. This has two sides,
one surprising and one frightening:
1. Is Intercept really that superior?
2. If Polyethylene is out after only 7 days, then what about acrylic
coatings, e.g. Humiseal 1B31? Will Chloride ions penetrate after only a
number of days, rather than years?
Furthermore, on page 17, 1 ppm Chloride is named 'normal environment'.
Who said that?
The dust from Iraq has up to 0.4 weight% of Sulphur or Chlorine (EDS).
If 1 ppm of Chloride penetrates 2 mils of Polyethylene in 7 days, then 0.4%
of Chlorine(Chloride)sounds to me like catastrophic!
What's the expert's opinion? I suppose there is no such experts in this
forum, but you may at least have an idea.
/Inge
-----Original Message-----
From: David Douthit [mailto:[log in to unmask]]
Sent: den 26 november 2007 19:05
To: TechNet E-Mail Forum; Hernefjord Ingemar
Subject: Re: [TN] Conformal Coating Breakdown and Iraqi dust
Inge,
Attached are 2 reports that should give you a better idea of the hazards you
are facing.
The first is titled "Avionics Systems, Reliability, and Harsh Environments"
June of 2001
The second is titled "Static Intercept and Corrosion Intercept" by Lucent
Technologies.
You have serious issues!
David A. Douthit
Manager
LoCan
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