Forget de Wahl, I don't think it's relevant in this case
Inge

On 22 October 2013 18:56, Inge Hernefjord <[log in to unmask]> wrote:

> 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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