They make an alumninum foil tape. It typically comes in 2" widths and is
primarily used to seal air handling ducts. It is only second in usefullness
to convention duct tape.

-- Bob Ammerman
RAm Systems=20

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Josh Koffman
Sent: Friday, January 18, 2013 1:09 PM
To: Microcontroller discussion list - Public.
Subject: [EE] Shielding a Plastic Enclosure

Hi all,

For the project I mentioned in my other post, I'm considering making my own
enclosure. I've become a bit better with that sort of simple mechanical
design, and it would allow me to build in guards to prevent unwanted switch
presses and protect cables and connectors a bit. This isn't anything really
complex, just a bit more than a standard rectangular case.

If I go this way, I'll have to use some sort of easily machinable material,
such as nylon, delrin, or some kind of HDPE. No problems there, but since
this device will be used with a radio nearby, I think it should be shielded
to help prevent interference. As a result, I'm looking for ideas on how to
shield the inside of a plastic enclosure.
I have found a couple of sprays that are available locally, but I'm not sur=
e
which is more suited to my application.

The first is MG Chemicals 838
http://www.mgchemicals.com/products/protective-coatings/emi-rfi-shielding/t=
o
tal-ground-carbon-conductive-coating-838/
This appears to be a carbon spray designed for shielding and creating
conductive ESD free surfaces.

The second is MG Chemicals 841
http://www.mgchemicals.com/products/protective-coatings/emi-rfi-shielding/s=
u
per-shield-nickel-841/
This is a spray with nickel in it.

I think the nickel spray would be better, but I'm not entirely sure.
I'm also not sure how well either of those would stick to the plastics I'm
looking at. Another option might be to try to adhere some aluminum foil to
the inside surfaces of the enclosure.

Any thoughts on which might be the more appropriate path to take?
Alternative ideas are definitely welcome!

Thank you!

Josh
--
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y
foolproof is to underestimate the ingenuity of complete fools.
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