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Date: | Mon, 7 Mar 2005 08:21:28 -0800 |
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Thank you all for your responses to my query. We have determined that we do
not have the resources to pursue this challenging project but I have
forwarded all of your responses to our customer and I invited him to contact
any of you directly if he thinks that your experience/services may prove
beneficial to him.
Regards
John
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Saturday, March 05, 2005 1:14 PM
To: [log in to unmask]
Subject: Re: [TN] Conductive Pattern on Lexan?
John,
The key to your question about circuitry on clear plastic is the required
adhesion. There is a whole industry dedicated to plating on plastics, and
many
standards and guidelines. I have inserted below information on this
business. The book is available from the National Association of Metal
Finishers
and I found at least one used book site that had it, too.
Lexan is one plastic molded into connectors, and these are frequently
plated
for EMI shielding. That requires temperature cycling and good adhesion.
Liquid Crystal Polymer is also a polycarbonate, so the cycle to chemically
etch
Lexan for good bonding would be similar, and LCP is now sometimes used in
flex circuitry.
Keeping one side clear to view through may be more of a problem - that will
have to be masked in the chemical etch to acheive adhesion. Is your
application "see through" or "know light is coming through"?. If you can
see through
plastic, by nature, it will be quite smooth - hence probably poor adhesion
from most processes - sputtering, electroless, conductive paste, etc.
Selective chemical etching where you want circuitry - possible, but you
will
probably need a couple of masking steps in sequence.
Contact me off line if you want our proprietary cycle for Lexan. Sheet
thickness - no problem. Length and width of part? This industry is used
to
plating automobile grilles and hubcaps. Gold finish - a matter of building
up
copper thickness, and then finishing with nickel and gold.
Denny Fritz
MacDermid, Inc.
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