Just wanted to make an observation on a comment Lee mentioned below. He said " We have trialled many times with our coatings and if you find you have a dodgy connection first time of fitting, the second time it connects." And that's fine by itself. An issue I have with that being a former Technician is that if you were to power up a device that might have a "dodgy" connection and not know it, you could cause an issue with perhaps a power/ground pin that connects after signals and cause a latch up or other damage to a circuit. I'm not saying that it will happen, but do you want to take a chance that it could? I would not like that done on an aerospace board or other high reliability board. Just an observation, nothing more. ;-/
Later...
Scott Decker | Senior Engineer, PCB Design Services CID+ | Electronic Systems Center
COLLINS AEROSPACE
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Hitchens
Sent: Wednesday, March 27, 2019 8:39 AM
To: [log in to unmask]
Subject: Re: [TN] [External] Re: [TN] 3M Novec
Hi Ed
No company will guarantee you can coat all components without problems.
That said the coating is typically less than a micron and 99% of the time it will be fine.
We have trialled many times with our coatings and if you find you have a dodgy connection first time of fitting, the second time it connects.
It's really going back to understanding what you are protecting against?
This will tell you of the fluoropolymer coatings are suitable for you.
Btw there are water based low cost versions of these very expensive materials now available. So if you're interested we can chat off line.
Best Regards
Dr Lee Hitchens
SCH Technologies is a Division of SCH Services Limited
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On Wed, 27 Mar 2019, 15:27 Edward Rios, <[log in to unmask]>
wrote:
> So getting Novec material on the connector contacts is not a concern?
>
> On Wed, Mar 27, 2019 at 9:55 AM Douglas Pauls <
> [log in to unmask]> wrote:
>
> > I would agree with Lloyd. I have worked with the 3M 1904 material
> > and
> like
> > it, but like any material, it has it's drawbacks. Durability may be
> > an issue as Lloyd stated. It may not be suitable for higher voltage
> > applications. The material is thin enough to not provide any
> > appreciable tin whisker mitigation.
> >
> > On the other hand, this stuff gets everywhere efficiently. The
> > Novec HFE carrier solvent takes it under parts. The relatively soft
> > nature of the material, which makes it a durability concern, also
> > means you don't have
> to
> > mask connectors. Can serve as supplemental coating to coat those
> > components (like connectors) not normally coated.
> >
> > *Douglas Pauls *| Principal Materials and Process Engr | Advanced
> > Operations Engineering
> >
> > *COLLINS AEROSPACE*
> >
> > 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
> >
> > *Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
> >
> > [log in to unmask]
> >
> >
> > On Wed, Mar 27, 2019 at 9:15 AM lduso - Diamond-MT.com <
> > [log in to unmask]>
> > wrote:
> >
> > > I have used it before on multiple customers product. It does have
> > > its
> > uses
> > > but like all materials, you need to test it to ensure it will
> > > achieve
> the
> > > desired result. It is by no means a highly durable coating like a
> > > UR or
> > XY.
> > >
> > > Lloyd Duso
> > > General Manager
> > > Diamond-MT
> > > (814) 535-3505
> > >
> > >
> >
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.Diamond-2Dmt.c
> om&d=DwIBaQ&c=ilBQI1lupc9Y65XwNblLtw&r=lTRDjB8ojaf7ZaJ9DHeDAm7e-HFP9fx
> Ikv6fRnV49HE&m=2M4OaB4ZydsNl8KqosE2Ed2Z7q_InK7_syHsUUGoWTA&s=0Ew7l-Aku
> _XnltftrBTCGsrBWiA-vGKAT3WORk9N5KQ&e=
> > >
> > >
> > > On Wed, Mar 27, 2019 at 10:01 AM Ed Rios <
> > > [log in to unmask]>
> > > wrote:
> > >
> > > > Good morning,
> > > >
> > > > Does anyone has experience with 3M Novec coatings? Any thoughts
> > > > on
> pros
> > > > and cons vs a conformal coating?
> > > >
> > > > Thanks,
> > > > Ed
> > > >
> > >
> >
>
>
> --
> *Ed Rios*
> Quality & Reliability
> *Motorola Solutions, Inc.*
>
> +1.847.576.4793
> [log in to unmask]
>
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.motorolasolut
> ions.com_&d=DwIBaQ&c=ilBQI1lupc9Y65XwNblLtw&r=Z5GKU9L_wgbp5uvPzUdN9HWtU4lRZiIaLoTaEwcy40w&m=psvTORYFWfEGgYHGm9ydoNqrSMx_x97vfrLHclTPHco&s=J4RwWLIZ0MZ-4qqzM9MkQ62YLpxjqyZmUUZ65fLFVJI&e=>
>
|
