Sorry for the lengthy delay in my replying to this string but Dymax has some recently new offerings which look very promising that maybe of interest.
Might be of value to speak to them again if that hasn't occurred lately.
Rich Kraszewski
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, September 03, 2015 11:50 AM
To: [log in to unmask]
Subject: Re: [TN] Selective Conformal Coat Systems
Steve,
There are a number of components that don't go well with conformal coating. Either the coating interferes with function, as Adrian indicates, or the components are not robust enough to withstand the solvents used.
Adrian, you might consider a UV curable peelable mask, on the order of a Dymax EMAX 906B or Dymax 9-20515. We have decent success with those and they are much faster than latex masks. I tested both for residues and both are good. The 906B is thicker, the 9-20515 is thinner.
Doug Pauls
Principal Materials and Process Engineer Rockwell Collins
On Thu, Sep 3, 2015 at 11:35 AM, Steve Gregory <[log in to unmask]> wrote:
> Hi again,
>
> One question that I have to ask out of curiousity, why would you be
> masking SMT components anyway, don't you want to coat them?
>
> Steve
>
> On Thu, Sep 3, 2015 at 10:30 AM, lduso - Diamond-MT.com <
> [log in to unmask]> wrote:
>
> > Tape is used most of the time and we use blue 3m masking tape (low
> > adhesion) on fragile components. If you are using a fine material
> > like
> 1B31
> > or other acrylics, then we may seal with latex if it is a connector
> > that may "wick" easily. That's why I asked what coating you were using.
> >
> > Lloyd Duso
> > Diamond-MT
> > Plant Manager
> > (814) 535-3505
> > www.Diamond-mt.com
> >
> > On Thu, Sep 3, 2015 at 11:23 AM, Adrian Dimulescu <
> [log in to unmask]
> > >
> > wrote:
> >
> > > We're using Humiseal TS300 (Pink Bubble-Gum type), the lifting
> > > occurs
> > when
> > > we try to pick the mask from around and on top of the components.
> > > We
> > tried
> > > masking with tape and lining the tape with the Humiseal TS300,
> > > though
> > this
> > > works, it's time consuming.
> > >
> > > What material and technique do you use?
> > >
> > > Thanks
> > >
> > > -----Original Message-----
> > > From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
> > > Sent: Thursday, September 03, 2015 11:01 AM
> > > To: [log in to unmask]
> > > Subject: Re: [TN] Selective Conformal Coat Systems
> > >
> > > I agree with Lloyd, if you are damaging components during demask,
> > > you
> are
> > > using the wrong materials and the wrong techniques.
> > >
> > > Trot them out here where we can see em and we'll help ya out.
> > >
> > >
> > > Doug Pauls
> > > Principal Materials and Process Engineer Rockwell Collins
> > >
> > > On Thu, Sep 3, 2015 at 9:55 AM, lduso - Diamond-MT.com <
> > > [log in to unmask]
> > > > wrote:
> > >
> > > > That sounds more like the problem, masking technique. We mask
> hundreds
> > > > a day and rarely damage anything. It's all in using the right
> > > > technique and as Steve said, the right material.
> > > >
> > > > What coating are you using?
> > > >
> > > > Lloyd Duso
> > > > Diamond-MT
> > > > Plant Manager
> > > > (814) 535-3505
> > > > www.Diamond-mt.com<http://www.Diamond-mt.com>
> > > >
> > > > On Thu, Sep 3, 2015 at 10:43 AM, Adrian Dimulescu
> > > > <[log in to unmask]
> > > > >
> > > > wrote:
> > > >
> > > > > That’s what we’re doing now, the issue is removing the mask as
> > > > > it will occasionally lift a pad or component. We’re looking
> > > > > to do
> away
> > > > > with masking.
> > > > >
> > > > >
> > > > >
> > > > > Thanks
> > > > >
> > > > >
> > > > >
> > > > > ------------------------------ *Adrian Dimulescu | Advanced
> > > > > Engineer | MtronPTI (NYSE MKT: LGL)*
> > > > > 2525 Shader Rd, Orlando, FL 32804
> > > > > Office: 407.298.2000
> > > > >
> > > > >
> > > > >
> > > > > *From:* lduso - Diamond-MT.com [mailto:[log in to unmask]]
> > > > > *Sent:* Thursday, September 03, 2015 10:41 AM
> > > > > *To:* TechNet E-Mail Forum; Adrian Dimulescu
> > > > > *Subject:* Re: [TN] Selective Conformal Coat Systems
> > > > >
> > > > >
> > > > >
> > > > > That low a volume, mask and spray by hand.
> > > > >
> > > > >
> > > > > Lloyd Duso
> > > > >
> > > > > Diamond-MT
> > > > > Plant Manager
> > > > > (814) 535-3505
> > > > >
> > > > > www.Diamond-mt.com<http://www.Diamond-mt.com>
> > > > >
> > > > >
> > > > >
> > > > > On Thu, Sep 3, 2015 at 10:39 AM, Adrian Dimulescu <
> > > > [log in to unmask]>
> > > > > wrote:
> > > > >
> > > > > Hello All,
> > > > >
> > > > > We're looking into purchasing a small (bench-top type)
> > > > > automated
> > > > selective
> > > > > conformal coat system. This will be used for 100 or so boards
> > > > > a week, therefore speed is not an issue. It is important that
> > > > > the system is selective as we only want to coat specific areas
> > > > > on the board. I wanted
> > > > to
> > > > > get a feel for what other are using and/or recommend.
> > > > >
> > > > > Many Thanks
> > > > >
> > > > >
> > > > >
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> > > Adrian Dimulescu | Advanced Engineer | MtronPTI (NYSE MKT: LGL)
> > > 2525 Shader Rd, Orlando, FL 32804
> > > Office: 407.298.2000
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> > >
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