The stuff McMaster sold is available from Aetna Plastics http://www.aetnaplastics.com/products/d/Chemgrip

The treating agent isn't that bad (it is poisonous but then what isn't?). It contains sodium metal, naphalene, diethlyene glycol dimethyl ether.  Reacts immediately with water, of course, as it contains sodium.

Bob


-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]] 
Sent: Tuesday, October 22, 2013 10:59 AM
To: TechNet E-Mail Forum; Bob Landman
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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