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November 2005

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Wed, 2 Nov 2005 11:39:52 EST
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I'm late to this discussion, but is it possible that the contamination  isn't
migrating upward from the board surface, but is instead condensing on the
coating surface from atmosphere? Position of the cleaning line, etc., might make
 this possible.

Mike Moninger
Thermospray Company, Inc.


>>>>Date:    Wed, 2 Nov 2005 10:35:42  +0100
From:    Ingemar Hernefjord  <[log in to unmask]>
Subject: SV: [TN] SV: [TN] SV: [TN] Urgent!  Acrylic coating

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=3D11 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





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