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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