Excellent story Scott. Thank you for sharing.
Along the line of ultra thins and pins, I had coated an assembly that was
very sensitive to anything on the pins. I dip coated it with an ultra-thin
(I stress this was during my "don't know what I am doing" phase), probably
4-5 times thicker than it normally would be. The unit passed functional
test at ambient, but failed in the first thermal cycle. The tech took the
unit apart, saw the displaced coating from the rubbed pins, and asked what
can I clean this crap with? The one I was working with (similar to the
1904 but not 1904) used the hydrofluoroether as the solvent, and Novec 7100
HFE solvent worked very well to remove the coating from the pins. Put the
unit back together and it ran 12 lifetimes of the unit.
*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 11:52 AM Decker, Scott Collins <
[log in to unmask]> wrote:
> Lee,
> Thanks for the reply. I was really just wanting to point out that it
> might be a good idea to clean the pins before electrical testing, etc. and
> not rely on the scraping of the connector pins to do the job. The remaining
> coating aspect is not my concern in this case. ;-)
>
> One of my first jobs was at a bowling alley. A friend of mine from High
> School called me since he know I was an electronics geek and asked if I
> knew anything about pin setting machines. Having never been any closer to
> one other than when I tossed a ball down the lane, I said NO, but he
> insisted that I should come take a look. After arriving and going back to
> the mechanical end of a bowling lane, I was introduced to a chassis with
> about 5 or 6 boards in them and all edge connectors to a backplane like
> housing. There were 16 lanes in the building and all but 1 were running.
> The other 15 were in various states of not running and they were worrying
> that opening night wouldn’t happen in less than a week. After pulling one
> of the boards out to inspect it, I asked for a pencil eraser. I proceeded
> to clean the gold contacts on that board and the other in the same chassis.
> Flipping the switch on, the lane came to life and my buddy ran to the
> office and brought back about 10 rubber erasers. We proceeded to clean
> every board contact set and within about 40 minutes, had all but one lane
> running just fine. The last one had a bad board in it, which I believe was
> due to the same contact issue, but caused a board to fail, but after
> dropping in a replacement board, that lane was running also. So, although
> it was not a conformal coating issue, (It was due to shipping the machines
> by ship from Japan to the US and all that salt water…) a clean contact is a
> happy contact. ☺ My friend was happy and the manager was happy too and
> opening night went off without a hitch. Oh, and yes, the boss said after I
> flipped on the last lane, You want a job? ☺ Yep, I took it…
>
> Sorry for the long story, but anyone that knows me will tell you, Yep,
> that’s Scott! :-] Take Care.
>
> Scott Decker | Senior Engineer, PCB Design Services CID+ | Electronic
> Systems Center
> COLLINS AEROSPACE
> 3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
> Tel: 602 308 5957 FAX: 602 243 2347
> [log in to unmask]<mailto:[log in to unmask]>
> http://www.collinsaerospace.com<http://www.collinsaerospace.com>
>
> CONFIDENTIALITY WARNING: This message may contain proprietary and/or
> privileged information of
> Collins Aerospace Systems and its affiliated companies. If you are not the
> intended recipient please 1) do not disclose, copy,
> distribute or use this message or its contents, 2) advise the sender by
> return e-mail, and 3) delete all copies (including all
> attachments) from your computer. Your cooperation is greatly appreciated.
>
> From: Lee Hitchens [mailto:[log in to unmask]]
> Sent: Wednesday, March 27, 2019 9:29 AM
> To: Decker, Scott Collins <[log in to unmask]>
> Cc: TechNet E-Mail Forum <[log in to unmask]>
> Subject: Re: [TN] [External] Re: [TN] 3M Novec
>
> Hi Scott.
>
> You're absolutely right. It's what we call "horses for courses". No
> coating fits all!
>
> If you're looking for a low cost solution that reduces eliminates masking
> then ultra thin coatings are of interest.
>
> If its ultra reliable coating then you tou have to be cautious of the
> coating applied.
>
> But, the issue of connectivity is a minor issue versus the critical factor
> of performance. Will the coating protect your board.
>
> At the end of the day if the coating will perform for you then it really
> is worth considering.
> Best Regards
>
>
> Dr Lee Hitchens
>
>
>
> SCH Technologies is a Division of SCH Services Limited
>
> Mob: +44 (0) 7862 25 33 21
>
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.conformalcoating.co.uk&d=DwIGaQ&c=ilBQI1lupc9Y65XwNblLtw&r=lTRDjB8ojaf7ZaJ9DHeDAm7e-HFP9fxIkv6fRnV49HE&m=HkJ8UklGWFY8RFBsQj3YxCm8k7mezRO1PqjKRM40I1c&s=l5ryqALjy0BWBGr79LXX_uQh05g9PY4F_vkhFu8kLOs&e=
> <
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.conformalcoating.co.uk&d=DwMFaQ&c=ilBQI1lupc9Y65XwNblLtw&r=LmNZumVuc-aB-duabR-Sh7bWYujYHapt9x3t3Yvsa1s&m=CGT6Vt9PodFHVoIhqwgaInu3jn437eY1a_znJPBsoSU&s=B_v6wxLz_6-2e2xv9MmJ7ehkPMDa2eSCEEUjX2_ZeXk&e=
> >
> Skype: leehitchens
>
>
>
> TECHNICAL SUPPORT SERVICE
>
>
>
> SCH Services Ltd offers a Technical Support Helpline to help address all
> issues relating to reliability. This includes contamination testing,
> cleanliness and cleaning issues, plus any coating related questions.
>
> Please contact us via email or telephone:
>
>
>
> [log in to unmask]<mailto:[log in to unmask]> +44 (0)1226 249019
> (office hours & answerphone) +44 (0)7862 253321(out-of-hours emergency)
>
>
> The opinions expressed in this e-mail are strictly those of the sender and
> not of SCH Services Limited. This communication may contain information
> which is confidential and may also be privileged. It is for the exclusive
> use of the intended recipient(s). Unauthorised use, copying or disclosure
> of any of it may be unlawful. If you are not the intended recipient(s)
> please note that any distribution, copying or use of this communication or
> the information in it is strictly prohibited. If you have received this
> communication in error please notify us by e-mail or by telephone (+44
> (0)1226 249019) and then delete the e-mail and any copies of it. Virus
> Warning - Although steps have been taken to ensure that all email and
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>
>
>
> Company Registration: 04043334
>
> Registered office: SCH Services Limited Newburgh Building McLintock Way
> Barnsley South Yorkshire S70 6BF
>
>
>
> On Wed, 27 Mar 2019, 15:48 Decker, Scott Collins, <
> [log in to unmask]<mailto:[log in to unmask]>> wrote:
> 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
> 3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
> Tel: 602 308 5957 FAX: 602 243 2347
> [log in to unmask]<mailto:[log in to unmask]>
> http://www.collinsaerospace.com<http://www.collinsaerospace.com>
>
> CONFIDENTIALITY WARNING: This message may contain proprietary and/or
> privileged information of
> Collins Aerospace Systems and its affiliated companies. If you are not the
> intended recipient please 1) do not disclose, copy,
> distribute or use this message or its contents, 2) advise the sender by
> return e-mail, and 3) delete all copies (including all
> attachments) from your computer. Your cooperation is greatly appreciated.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]<mailto:[log in to unmask]>] On Behalf
> Of Lee Hitchens
> Sent: Wednesday, March 27, 2019 8:39 AM
> To: [log in to unmask]<mailto:[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
>
> Mob: +44 (0) 7862 25 33 21
>
>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.conformalcoating.co.uk&d=DwIBaQ&c=ilBQI1lupc9Y65XwNblLtw&r=Z5GKU9L_wgbp5uvPzUdN9HWtU4lRZiIaLoTaEwcy40w&m=psvTORYFWfEGgYHGm9ydoNqrSMx_x97vfrLHclTPHco&s=GyCG3Y-bVlwK3ryeXua4HuXDG-h3Bs3uWKlp1BeI3cU&e=
> Skype: leehitchens
>
>
>
> TECHNICAL SUPPORT SERVICE
>
>
>
> SCH Services Ltd offers a Technical Support Helpline to help address all
> issues relating to reliability. This includes contamination testing,
> cleanliness and cleaning issues, plus any coating related questions.
>
> Please contact us via email or telephone:
>
>
>
> [log in to unmask]<mailto:[log in to unmask]> +44 (0)1226 249019
> (office hours &
> answerphone) +44 (0)7862 253321(out-of-hours emergency)
>
>
> The opinions expressed in this e-mail are strictly those of the sender and
> not of SCH Services Limited. This communication may contain information
> which is confidential and may also be privileged. It is for the exclusive
> use of the intended recipient(s). Unauthorised use, copying or disclosure
> of any of it may be unlawful. If you are not the intended recipient(s)
> please note that any distribution, copying or use of this communication or
> the information in it is strictly prohibited. If you have received this
> communication in error please notify us by e-mail or by telephone (+44
> (0)1226 249019) and then delete the e-mail and any copies of it. Virus
> Warning - Although steps have been taken to ensure that all email and
> attachments are virus-free, we cannot guarantee nor be held liable.
>
>
>
> Company Registration: 04043334
>
> Registered office: SCH Services Limited Newburgh Building McLintock Way
> Barnsley South Yorkshire S70 6BF
>
>
>
> On Wed, 27 Mar 2019, 15:27 Edward Rios, <[log in to unmask]
> <mailto:[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]<mailto:
> [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]<mailto:[log in to unmask]>
> > >
> > >
> > > On Wed, Mar 27, 2019 at 9:15 AM lduso - Diamond-MT.com <
> > > [log in to unmask]<mailto:[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]<mailto:
> [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]<mailto:
> [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=>
> >
>
|
