Just a couple of quick things, and they are dated so maybe life has
changed for the better by now.
One of the problems with the coatings originally was that the
sprayed versions did not stay adhered to the base plastic. That lead to a
requirement to age the product during the type certification, and to
control, not only the plastic but the guy applying the plastic, and the
spray material itself.
You want to find material that has very low bulk resistivity e.g. <
0.5 ohms.
You have to watch the tight corners and bends in the plastic, the
coating doesn't always wick into these spaces very well.
There are a lot of environmental concerns and safety concerns just
in the process of applying the coating. Some of the old methods included
sputtering which was pretty much like applying with an electric blow torch,
etc.
There is another version in which metal flakes are injected into the
plastic, it has some cosmetic concerns - the surface if fairly rough.
Probably of more concern is that the flakes wear out the molds much more
quickly.
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Monday, August 20, 2001 12:13 PM
To: [email protected]
Subject: RE: Conductive Coatings
Other issues include recycling of materials per the proposed EU directive.
See http://europa.eu.int/comm/enterprise/electr_equipment/eee/index.htm
<http://europa.eu.int/comm/enterprise/electr_equipment/eee/index.htm>
Richard Woods
----------
From: John Juhasz [SMTP:[email protected]]
Sent: Monday, August 20, 2001 2:30 PM
To: '[email protected]'
Subject: Conductive Coatings
Greetings . . .
Beginning to consider conductive coatings for EMC shielding.
To be used inside a plastic cover (material as yet unknown) in
a low power/voltage (SELV) application.
This is unfamiliar territory.
I'm sure someone on this listserv has experience with these.
I know to at least consider shielding effectiveness, material
compatibility (plastic housing material to coating), and
end-user environment. What are some other critical criteria?
Thanks.
John A. Juhasz
Product Qualification &
Compliance Engineer
Fiber Options, Inc.
80 Orville Dr.
Suite 102
Bohemia, NY 11716 USA
Tel: 631-419-2324 (direct)
Fax: 631-567-8322
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