Agree with Joyce. I used Plasma etching with Argon with acceptable result.
Note that you do not change the chemistry, while Brian's method
does.Whatever way you select you'll not get kovalent bindings, only
elctrostatic, mechanical and de Wahl's .
Inge

On 22 October 2013 16:08, Joyce Koo <[log in to unmask]> wrote:

> Localized plasma if it is possible.  (depend upon which stage you want to
> repair.  At PWA level,-"very difficult").
>
> Joyce Koo
> Researcher
> Materials Interconnect Lab
> Office: (519) 888-7465 79945
> BlackBerry: (226) 220-4760
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
> Sent: Tuesday, October 22, 2013 10:59 AM
> To: [log in to unmask]
> Subject: Re: [TN] Bonding to PTFE
>
> You need an etchant containing a strong sodium hydroxide, ammonia and
> tetrahydrofuran, which will remove the outer fluorine atoms, leaving an
> electrically charged surface that will bond to adhesives. However, this
> is a very toxic, caustic, really nasty stuff and your H&S guys will
> baulk at its use, after the first operator drops dead! In addition, I
> think that removing the residues after etching and before glueing will
> be electrically ultra-problematic.
>
> I would suggest that mechanically abrading would really be your best
> compromise, hopefully providing a key to a low-viscosity solvent-free
> epoxy.
>
> Brian
>
> On 22.10.2013 17:21, Bob Landman wrote:
> > Bob,
> >
> > McMaster Carr supplies a Teflon epoxy system which has a liquid etchant
> to prepare the surface for their two component epoxy. Its packaged in a
> circular cardboard box with a screw top lid.  We've used it to bond Teflon
> to aluminum for decades. Don't know if it works on epoxy/resin boards but
> as it can bind Teflon to Teflon (another app we have a requirement for)
> give them a call to see what they recommend.
> >
> > Bob Landman
> > H&L Instruments,LLC
> >
> >
> > Sent from my iPhone
> >
> > On Oct 22, 2013, at 10:09 AM, Bob Wettermann <[log in to unmask]> wrote:
> >
> >> Can a chemist/board SME tell me if an epoxy/resin system will bond to a
> PTFE
> >> matrix laminate for pad/trace repair?
> >>
> >> Thanks!
> >>
> >> Bob Wettermann
> >>
> >>
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