right you are, seeking him I will, not waiting until, going too far (Yoda). Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner Sent: den 28 november 2007 11:29 To: [log in to unmask] Subject: Re: [TN] Conformal Coating Breakdown and Iraqi dust 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. 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