Sorry late coming to thread
Concur and predictable - the mechanism is exactly same as caustic paint
stripping.
Regards
Mike Fenner
Indium Corporation
T: + 44 1908 580 400
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: 02 November 2005 13:11
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] SV: [TN] SV: [TN] Urgent! Acrylic coating
Inge,
Humiseal 1B31 is not all that "tough". As a pure acrylic, it has a tendency
to have poor chemical resistance, so I am not surprised that a saponifier
chemical would eat through it. Some work I have done in the past has shown
that most saponifiers, in pure form, can function as conformal coat
strippers. Not recommended through.
Doug Pauls
Ingemar
Hernefjord
<[log in to unmask] To
IPNET.SE> [log in to unmask]
Sent by: TechNet cc
<[log in to unmask]>
Subject
[TN] SV: [TN] SV: [TN] SV: [TN]
11/02/2005 03:35 Urgent! Acrylic coating
AM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
Ingemar
Hernefjord
<[log in to unmask]
IPNET.SE>
Richard, that's what I'm thinking too. Before the coating, the boards are
washed in a Vigon machine. I've been suspicious about Vigon 200 before (lots
of TN postings) because of it's pH=11 value and uncomplete content
declaration (Brian). Nothing bad about Vigon 200 in general, the cleaning
works just fine, but there may be special cases, who knows what can be
absorbed on the very surface of the boards. How possible Vigon or other
residues can pass that tough Humiseal layer in such short a time, I don't
understand. All coatings are penetrable, but it ought to be a very, very
slow process. That's why we coat the boards.
Inge
-----Ursprungligt meddelande-----
Från: Stadem, Richard [mailto:[log in to unmask]]
Skickat: den 1 november 2005 20:17
Till: Abdel, Philip M
Kopia: Ingemar Hernefjord; TechNet E-Mail Forum
Ämne: FW: [TN] SV: [TN] SV: [TN] Urgent! Acrylic coating
Phil, perhaps you could respond with some ideas.
Thanks
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard
Sent: Tuesday, November 01, 2005 12:51 PM
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] SV: [TN] Urgent! Acrylic coating
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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