Most glass products block deep UV rays, you actually have to spend quite a
bit of money if you want to use glass that will pass 350nm and below. And
most clear acrylics will block UV(again,you can get UV passing plastics but
they cost $$$). Glass has the advantage over plastic in that UV exposure
will smash the bonds in the plastic and cause it to craze, this is what you
see on older plastic car parts where it looks like the color has bled out of
them or in clear acrylics the plastic almost appears to have shattered w/o
breaking apart. So if you want a window that holds up over time I suggest
going with glass(and no boro float glass, that passes UV).
I might suggest only putting a window on the areas that require
illumination. Cover everything else up. UV is nasty and it's energy is
great for smashing the bonds of just about any material, plastics or
DNA(skin cancer anyone?).
From: Dave McGuire <[EMAIL PROTECTED]>
Reply-To: gEDA user mailing list <[email protected]>
To: [email protected]
Subject: gEDA-user: OT: UV exposure?
Date: Tue, 27 Jun 2006 02:21:16 -0400
Hey folks. I'm working on a design which will live in direct sunlight.
It will be under glass and I can seal the chassis, so there won't be any
moisture issues, but the PCB will be exposed to sunlight every day.
Does anyone know if I'm going to have problems with the UV breaking down
the PCB material? If so, is there some sort of coating that I could put on
the board to mitigate this?
Thanks,
-Dave
--
Dave McGuire
Cape Coral, FL
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