one cautionary note: MIL usually use high voltage parts >5V on the
connector. if you are start using commercial low voltage 1.3 - 1.5
V, you might have problem even with ultra thin coating. IMHO.
jk
On Mar 27, 2019, at 12:58 PM, Douglas Pauls wrote:
> 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=ilBQI1lupc9Y65XwNblL
>> tw&r=lTRDjB8ojaf7ZaJ9DHeDAm7e-
>> HFP9fxIkv6fRnV49HE&m=HkJ8UklGWFY8RFBsQj3YxCm8k7mezRO1PqjKRM40I1c&s=l5
>> ryqALjy0BWBGr79LXX_uQh05g9PY4F_vkhFu8kLOs&e=
>> <
>> https://urldefense.proofpoint.com/v2/url?
>> u=http-3A__www.conformalcoating.co.uk&d=DwMFaQ&c=ilBQI1lupc9Y65XwNblL
>> tw&r=LmNZumVuc-aB-duabR-
>> Sh7bWYujYHapt9x3t3Yvsa1s&m=CGT6Vt9PodFHVoIhqwgaInu3jn437eY1a_znJPBsoS
>> U&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
>> 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, 15:48 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=ilBQI1lupc9Y65XwNblL
>> tw&r=Z5GKU9L_wgbp5uvPzUdN9HWtU4lRZiIaLoTaEwcy40w&m=psvTORYFWfEGgYHGm9
>> ydoNqrSMx_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-A
>>> ku
>>> _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_wgbp5uvPzUdN9HW
>> tU4lRZiIaLoTaEwcy40w&m=psvTORYFWfEGgYHGm9ydoNqrSMx_x97vfrLHclTPHco&s=
>> J4RwWLIZ0MZ-4qqzM9MkQ62YLpxjqyZmUUZ65fLFVJI&e=>
>>>
>>
|
