I'm not familiar with dyne requirements. Can you elaborate of point me
to some literature?
Jim Marsico
EDO Corporation
Amityville: 631-630-5079
Bohemia: 631-218-7057
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Charlie Pitarys
Sent: Monday, April 09, 2007 4:09 PM
To: [log in to unmask]
Subject: Re: [TN] Water-break Test
You say " We're also expected to meet a water-break test prior to
bonding."
Have you been given a specific dyne range to meet?
For surface cleanliness in metal finishing applications these are simple
and
easy to use. Some of my customers use dyne pens. Typically used in prior
to
coat or paint specs.
Pens or solution kits are available through several suppliers. I have
some
links below.
The most important thing though is to have a realistic range specified.
To
hit one number will have you pulling out your hair or jumping off a
bridge.
www.dynepens.com
www.jemmco.com
Best regards,
Charlie
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James
Sent: Monday, April 09, 2007 1:48 PM
To: [log in to unmask]
Subject: Re: [TN] Water-break Test
So, you're suggesting etch the boards, water rinse, IPA rinse, acid
wash? What type of mild acid would you suggest? Do you need to D.I.
water rinse after the final acid wash?
Jim Marsico
EDO Corporation
Amityville: 631-630-5079
Bohemia: 631-218-7057
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Frederick Miller
Sent: Monday, April 09, 2007 3:40 PM
To: [log in to unmask]
Subject: Re: [TN] Water-break Test
I believe you need to use IPA as a first wash followed by a mild acid
wash. The supplier of the echant should be able to help.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of R Sedlak
Sent: Monday, April 09, 2007 1:32 PM
To: [log in to unmask]
Subject: Re: [TN] Water-break Test
Jim:
My suspicion is that it may well be impossible for you to get PTFE to
pass water break, certainly no cleaning/treatment after etch is going to
help.
The water break test is all about wetting, and PTFE is not going to wet
by water.
That said, what is supposed to be happening with the sodium based etch,
is it is supposed to remove the Fluorine and thus convert the surface
into something else other than PTFE, presumeably more wettable.
I suggest that you take a test panel, and over-etch excessively. It
could easily be that you are not etching enough.
Are you agitating during etching? I suspect this would help.
Rudy Sedlak
RD Chemical Company
"Marsico, James" <[log in to unmask]> wrote: Hello Technet:
We have an application where we have to etch a PTFE PWB in preparation
for bonding. The etch is a commercially available sodium-containing
solution. We're also expected to meet a water-break test prior to
bonding. We're having trouble meeting the water-break test and was
wondering if the two (etched PWB and water-break) are compatible. If
so, what cleaning/rinsing could be performed after the etching to ensure
a water-break free surface?
Thanks in advance,
Jim Marsico
EDO Corporation
Amityville: 631-630-5079
Bohemia: 631-218-7057
[log in to unmask]
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