Hi John
Thanks a lot, good information
Regards,
Angel Reyes
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Goulet
Sent: Tuesday, March 23, 2010 1:00 PM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coat Over No-Clean Flux
To Angel Reyes
We used Envirogold 816, Kyzen has a similar product that is used in a
batch cleaner to remove the No-clean flux.
Immediately after the boards are removed from the batch cleaner they
must be washed in the aqueous cleaner to remove the saponifer from the
etches and solder joints.
The conformal coat will now have the required clean surface to have
proper adhesion.
PS. Kyzen, Manchester NH, makes a good batch cleaner.
John Goulet
Process Engineer
----- Original Message -----
From: Angel LAM2 4429 Reyes
To: [log in to unmask]
Sent: Mon, 8 Mar 2010 17:14:10 +0000 (UTC)
Subject: Re: [TN] Conformal Coat Over No-Clean Flux
Could someone share what is the material and process to clean No-Clean
Flux residues under:
1- Immediately after soldering process
2- After few hours/days of soldering process
Regards,
Angel Reyes
Rain Bird Corp.
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Thursday, March 04, 2010 3:36 PM
To: [log in to unmask]
Subject: Re: [TN] Conformal Coat Over No-Clean Flux
I'm working with equipments that are going to live for 10 or up to 20
years.
CC can be a risk by closing in small ionic particles, which will sleep
like
virus for years, and suddenly wake up when the conditions change to
their
favor. We cannot be without CC, but cleanliness has to be at top always.
Luckily, we are payed to keep that costly cleaning process alive every
day.
No doubt the No Clean saves money, but I doubt they will come to the
same
failure free level. We have proposed NC, but our MIL customers use to
say
no.
Inge
--------------------------------------------------
From: "Roberts, Jon (SA-1)"
Sent: den 4 March 2010 15:04
To:
Subject: Re: [TN] Conformal Coat Over No-Clean Flux
> We use Humiseal UV40. I thought that out, but have no data to support
it
> success or failure with regards to coating over a no clean flux used
for
> attaching through hole components that cannot go through a wash.
>
> Jon
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
> Sent: Thursday, March 04, 2010 4:38 PM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal Coat Over No-Clean Flux
>
> And Doug forgot one of our favorite quotes - " Experience is what you
> get
> right after you need it "
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
>
>
>
> Douglas Pauls
> Sent by: TechNet
> 03/04/2010 04:17 PM
> Please respond to
> TechNet E-Mail Forum ; Please respond to
> [log in to unmask]
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Conformal Coat Over No-Clean Flux
>
>
>
>
>
>
> No doubt, the Technet forum tis a great thing. I seem to recall us
> discussing this issue at length about a year or so ago. I suspect
that
> if
>
> you search the archives, you would find the thread.
>
> Along the lines of what you ask. While Rockwell does use low residues
> fluxes (low residue is a flux, no-clean is a process) and we clean
them,
>
> we also have a very successful "reduced clean" where we solder on
parts
> that are either intolerant to our water wash process or it is "bloody
> inconvenient (I am feeling British this afternoon). We often
> conformallly
>
> coat over those residues, usually Alpha Telecore Plus or Kester 245
> )both
> ROL0), successfully with Humiseal 1B31 acrylic or Humiseal 1H20AR1
> acrylic-urethane. I know that you are looking at using urethanes, but
> don't use those very often.
>
> Anyone who knows Hillman or I know we test the crap out something
before
>
> we ever allow it on product, so we looked at combinations of cored
wire
> flux with additive fluxes, and the resultant combinations with the
> coatings, mostly the solvents in the coatings which would have a
> tendency
> to soak into the residues, potentially altering the chemical nature of
> the
>
> resulting mix.
>
> I think that you will largely find that solvent based coatings, such
as
> one part urethanes or acrylics generally adhere pretty well to low
> solids
> flux residues, but again, depends on the flux.
>
> I can and does work, but like anything, ya gotta do the testing, test
> drive the car, kick the tires, etc.
>
> If'n ya knows what yur doin', life is great. If not, experience is an
> expensive educator, but often very thorough.
>
> Doug Pauls
>
>
>
> Ken Bloomquist
> Sent by: TechNet
> 03/04/2010 03:38 PM
> Please respond to
> TechNet E-Mail Forum ; Please respond to
> Ken Bloomquist
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Conformal Coat Over No-Clean Flux
>
>
>
>
>
>
> Doug,
>
> One of the great things about the TechNet is the traction you can get
> from
> the efforts of people who have gone before. While I know that "good"
> testing
> is required for every application I was hoping that I would here
> something
> like; "I had great results using a Xylene based Polyurethane moisture
> cure
> coating over ROLO no-clean flux." Or "I tried Xylene based
Polyurethane
> moisture cure coating over ROLO no-clean flux and it was a disaster!"
>
> I know that my application will be a little different than anyone
else's
>
> and
> require testing but was just hoping for a baseline.
>
> KennyB
>
> -----Original Message-----
> From: Douglas Pauls [mailto:[log in to unmask]]
> Sent: Thursday, March 04, 2010 1:42 PM
> To: [log in to unmask]
> Subject: Re: [TN] Conformal Coat Over No-Clean Flux
>
> Jon,
> While that is true, that only relates to the compatibility between
> fluxes.
>
>
> Seldom do you have flux vendors also providing coatings. It is the
> product of the combined flux residues with the coating, especially the
> solvent carrier, that you have to watch out for.
>
> Doug Pauls
>
>
>
>
>
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