Hi Ingemar:
Do you want to see a board that the coating has potato chipped? I do not have anyone at the moment, but it is easy to do. Get a scrap board that is coated with polyurethane or Acrylic, soak it in alcohol for about five minutes. Place the soaked board in a sealed container. Leave it there 24 hours or so. The board coating will be very soft and in some areas will look like potato chips.
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ingemar Hernefjord
(KC/EMW)
Sent: Wednesday, February 02, 2005 3:17 AM
To: [log in to unmask]
Subject: Re: [TN] Coating
Sure? That was a very frightening message! Do you have example? Can you send pic offline?
We've made a lot of boards for various aircrafts, with acrylic, never seen or heard of what you say.
Acrylic coating does not always withstand stillstanding contaminated water. Exposed a longer time to such
ionic wetness, the coating can absorb water, swell, and lift from the board. We don't know exactly how this
happens, and have just seen a few cases. Acrylic coating use to be splendid.
Ingemar Hernefjord
Ericsson Microwave Systems
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]
Sent: den 1 februari 2005 18:30
To: [log in to unmask]
Subject: [TN] Coating
All Technetters :
In advance, thanks for your insights. Does anybody have any experience with boards that are acrylic coated and exposed to Jet fuel fumes.? Boards are not located next to the jets, but the fumes propagate to the boards that are housed in a metal cabinet. My understanding is that jet fuel is similar to kerosene. Through experimentation, I know that alcohol fumes that are inside a close container with the a board , can weaken acrylic and polyurethane coating and sometimes the coating will potato chip.
Regards,
Ramon
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