Inge, I am not an expert at conformal coat, but the fact that the Fourier transforms show a possible contaminant at the different locations in the spectrum, and the fact that they do not show up in the conformal coating until full cure as you state, after some days, could this indicate some type of outgassing from the assembly being trapped under the coating? I am thinking this could be released when you bake the boards or subject them to heat. Could this be a reaction to a new epoxy or some other material on the board? It seems you have exhausted all of the sources except possibly the board itself.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord
Sent: Tuesday, November 01, 2005 11:23 AM
To: [log in to unmask]
Subject: [TN] SV: [TN] SV: [TN] Urgent! Acrylic coating
A wide lambda infrared light is radiated through the transparent organic sample, whereof some is absorbed and some pass and be reflected.
Dependent on the chemical composition, a specific organic absorbs a certain percentage of ligth at various lambda, e.g x% at 1000 nm, y% at 1500 nm, z% at 2,500 nm etc. You get a curve with absorption f(lambda) with characeristic peaks. By means of an enormous library, you can identify thousands of known organics. That's also why you can identify possible organics from foreign object in the universe, same principle.
So, I hoped that someone who is familiar with FTIR could recognize something valuable.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Dehoyos, Ramon
Skickat: den 1 november 2005 15:21
Till: [log in to unmask]
Ämne: Re: [TN] SV: [TN] Urgent! Acrylic coating
Inge, could you make comments on the three spectra charts, that were posted by Steve, for the uninformed and ignorant as me?
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen R Gregory
Sent: Tuesday, November 01, 2005 8:56 AM
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] Urgent! Acrylic coating
Mornin' Inge!
I got your pictures up...I put them all in one picture.
They came to me as *.GIF images....I hope they are
clear enough to see everything. Check
out:
http://stevezeva.homestead.com/files/Inges_Spectra.jpg
Kind regards,
-Steve Gregory-
Senior Process Engineer
LaBarge Incorporated
Tulsa, Oklahoma
(918) 459-2285
(918) 459-2350 FAX
Ingemar Hernefjord <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
11/01/2005 03:00 AM
Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Ingemar Hernefjord <[log in to unmask]>
To: [log in to unmask]@SMTP@Exchange
cc: (bcc: Stephen R Gregory/LABARGE)
Subject: [TN] SV: [TN] Urgent! Acrylic coating
Hi all,
We have not solved the problem yet.
1. The Humiseal we use is 1B73
2. The thinner is 604
3. FTIR of 'crystals' gave VIGON 200 residues + poly ammoniumacrylate
4. No problems with nozzles or spray, no webbing
5. All mixing procedures according to Humiseal
6. Pattern does not appear until after some days
7. Pattern disappears after heat treatment of boards.
8. Humidity in air pipeline under investigation.
I'll send spectras to Steve FYI
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Graham Naisbitt
Skickat: den 31 oktober 2005 13:22
Till: [log in to unmask]
Ämne: Re: [TN] Urgent! Acrylic coating
Hi Steve
WOW, I have never seen anything like that before. We shall study further
and
discuss with colleagues - weird.
Also, Dewey and I were both trying to get over to say "howdy" to you,
but
you had disappeared! We looked everywhere so have to figure you were out
in
the Casino?
--
Regards, Graham Naisbitt
[log in to unmask]
CONCOAT LIMITED
Alasan House, Albany Park
Camberley, Surrey GU16 7PH
Phone: +44 (0)1276 691100
Fax: +44 (0)1276 691227
www.concoat.co.uk
On 28/10/05 13:07, "Steve Gregory"
<[log in to unmask]> wrote:
> Mornin' Inge!
>
> Well, I'm back from Vegas. Got out of there only $100 in the hole...I
> guess that's better than most people get out of there losing.
>
> Anyways, I have your pictures posted.
Go to:
>
>
http://www.stevezeva.homestead.com/files/Frosty_Pattern.jpg
>
http://www.stevezeva.homestead.com/files/Frosty_Pattern_2.jpg
>
> That does look exactly like frost!
Pretty weird!
>
> Kind regards,
>
> -Steve Gregory-
> Senior Process Engineer
> LaBarge Incorporated
> Tulsa, Oklahoma
> (918) 459-2285
> (918) 459-2350 FAX
>
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