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January 2003

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Subject:
From:
Donald Durett <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 30 Jan 2003 08:22:37 -0500
Content-Type:
text/plain
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text/plain (72 lines)
We bond PTFE and FEP Teflon using Aremco '526N epoxy adhesive. The Teflon
must be etched before it will accept any bonding agent. Check the aremco.com
website.

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, January 29, 2003 9:24 PM
To: [log in to unmask]
Subject: [TN] Adhesive for Teflon


'Morning, All

This object of this problem is not a board, but a wave guide with a (PTFE?)
teflon dome bonded to it - or at least to what looks like glass fibre
cladding on the waveguide flange. The guide is pressurised to 28 p.s.i. at
1 atmosphere.

 Wall thickness of the dome is approx 10 mils. The flange that it's bonded
to measures about 2.75" x 1.5" x 0.4" thick and there are traces of a
yellow-coloured material, which I take to be the adhesive that bonds the
teflon dome to the flange. I cannot be sure, though.

The problem now is that the dome has separated from the flange along one
side so that it can no longer be pressurised. It's a very expensive
component, and worth repairing if possible. Does any one of you great folks
know of an adhesive and method of application that would be effective in
rebonding the teflon back onto the GF-coated flange? Obviously the adhesive
must stick well to low-energy surfaces, but additonally it must have good
tensile adhesion, since the internal pressure of the dome will tend to
"peel" the rectangular wall away from the flange.

Any help will be greatly appreciated. At present, components that have been
'punctured' like this are just thrown away and replaced with new ones, and
there may be a very good reason for this - like it's not possible to remove
the dome, clean it up and bond it back in place again, but I thought I
would ask anyway.

TIA

Peter

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