Joyce pointed out that if I'd read further down, I'd have seen Richard's
original request, which contained a pretty good description of the
operating environment. My apologies for accusing the esteemed brain trust
of ignoring the requirements!
No temperature range given, but buried, so no fast temperature cycling, and
probably below any frost line. Significant chance of saturation and the
polypropylene enclosure being breached. Gels provide extreme moisture
protection: The silicone oil in them naturally prevents water from forming
a continuous chain (causes beading/hydrophobic). These materials allow
moisture to pass through but because there is not a continuous path, no
conductivity or corrosion. And they self-seal, so no cracks are possible
without extreme mechanical assistance.
Example:
https://www.newark.com/raytech/techno-gel-gum/potting-compound-bottle-1lt-blue/dp/80Y4901
Another classic is a weak silicone gel. Dow Corning 527 is a 2 part mix.
I've found that stuff used to protect electronics in under hood conditions.
But the weak gel is kind of gross stuff--sticks to everything. It does pot
very well--very low viscosity.
Wayne Thayer
On Wed, May 5, 2021 at 6:32 AM Wayne Thayer <[log in to unmask]> wrote:
> Folks-
>
> You can tell we're all solutions-focused engineers! All eager to share
> what's worked for us. But we're so excited about solutions we haven't asked
> Richard Hatano any more probing questions about his usage case:
>
> He indicates he wants "tough protection". But protection from what?
> -Survival of drastic rapid temperature extremes like satellites?
> -Extreme moisture resistance such as an outdoor product in a crappy
> package--or even under water?
> -Under hood (moisture and extreme thermal)?
> -Protection from rough handling?
> -Quantity and value of units to be processed?
> -Delta value if a protection solution works?
> -What kind of lifetime?
> -Is he looking for easy installation of in-house capability?
> -Does reworkability matter?
> -How important is it to use "green" materials?
> -Describe the usage environment. What kind of deviations in the usage
> environment are expected (cyclic loading such as temperature, humidity,
> vibration)?
> -Is the coating expected to aid in EMI or ESD issues?
>
> And I'll bet everyone on the forum can come up with even more questions.
> As you think about those questions, the "best" solution for Richard is
> likely to change--after all, that's why so many solutions are out in the
> market!
>
> Wayne Thayer
>
>
> On Tue, May 4, 2021 at 7:11 AM Yuan-chia Joyce Koo <[log in to unmask]>
> wrote:
>
>> transfer molding is better even for medium size - faster, uniform to
>> ensure quality. Usually, the molding compound is design for semi,
>> much uniform stress distribution (filler size and pack), and less
>> corrosion (low ionics). but you pay for capital equipment and
>> material in exchange for labour cost and speed, quality. IMHO.
>> agree with Doug totally. (usually you need secondary cure in oven
>> after the molding. Do it slowly, it will reward you for long term
>> reliability - particularly, in 100 yr case.. interfacial stress
>> release better if you select compound correctly).
>> jk
>> On May 4, 2021, at 9:24 AM, Douglas Pauls wrote:
>>
>> > If there are a large number of the units to be made, low pressure
>> > molding
>> > would also be an option.
>> > ---
>> > *Douglas Pauls *| Technical Fellow | Electronics AMT
>> >
>> > *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]
>> >
>> > [log in to unmask] for all Export Compliant Items
>> >
>> >
>> > On Tue, May 4, 2021 at 7:51 AM Richard Kraszewski <
>> > [log in to unmask]> wrote:
>> >
>> >> Yes Agreed.
>> >> Potting is even a better choice.
>> >>
>> >> Rich Kraszewski
>> >>
>> >>
>> >> * * * * * * * * CONFIDENTIALITY NOTICE * * * * * * * *
>> >> This e-mail and any attachments are confidential from Plexus Corp.
>> >> and may
>> >> contain information which is privileged, confidential, and/or
>> >> protected by
>> >> non-disclosure agreements. They are intended solely for the use
>> >> of the
>> >> named addressee(s). . Any unauthorized use or disclosure may be
>> >> unlawful. If you are not a named addressee, you must not use,
>> >> disclose,
>> >> retain or reproduce all or any part of the information contained
>> >> in this
>> >> e-mail or any attachments If you have received this transmission
>> >> in error,
>> >> please destroy it and notify us immediately by return e-mail or by
>> >> calling
>> >> + 1 888 208 9005.
>> >>
>> >> -----Original Message-----
>> >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
>> >> Sent: Monday, May 3, 2021 4:56 PM
>> >> To: [log in to unmask]
>> >> Subject: Re: [TN] [External] Re: [TN] TechNet archives? looking for
>> >> information on coating or encapsulation long term protection
>> >>
>> >> <html><body><p style="background-color:#F5AD7C; border:1px solid
>> >> black;">[EXTERNAL] Use caution when clicking links or attachments
>> >> from
>> >> unknown senders.</p><br></body></html> Don't know Rich. Sounds
>> >> like he is
>> >> looking more for a potting material.
>> >> ---
>> >> *Douglas Pauls *| Technical Fellow | Electronics AMT
>> >>
>> >> *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]
>> >>
>> >> [log in to unmask] for all Export Compliant Items
>> >>
>> >>
>> >> On Mon, May 3, 2021 at 4:52 PM Richard Kraszewski <
>> >> [log in to unmask]> wrote:
>> >>
>> >>> I will that a guess that the coating you are looking for is likely
>> >>> parylene, or possibly a silicone coating.
>> >>>
>> >>> Rich Kraszewski
>> >>> Plexus
>> >>>
>> >>> * * * * * * * * CONFIDENTIALITY NOTICE * * * * * * * * This e-
>> >>> mail and
>> >>> any attachments are confidential from Plexus Corp. and may contain
>> >>> information which is privileged, confidential, and/or protected by
>> >>> non-disclosure agreements. They are intended solely for the use of
>> >>> the named addressee(s). . Any unauthorized use or disclosure
>> >>> may be
>> >>> unlawful. If you are not a named addressee, you must not use,
>> >>> disclose, retain or reproduce all or any part of the information
>> >>> contained in this e-mail or any attachments If you have received
>> >>> this
>> >>> transmission in error, please destroy it and notify us
>> >>> immediately by
>> >>> return e-mail or by calling
>> >>> + 1 888 208 9005.
>> >>>
>> >>> -----Original Message-----
>> >>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Hatano
>> >>> Sent: Monday, May 3, 2021 11:58 AM
>> >>> To: [log in to unmask]
>> >>> Subject: Re: [TN] TechNet archives? looking for information on
>> >>> coating
>> >>> or encapsulation long term protection
>> >>>
>> >>> <html><body><p style="background-color:#F5AD7C; border:1px solid
>> >>> black;">[EXTERNAL] Use caution when clicking links or attachments
>> >>> from
>> >>> unknown senders.</p><br></body></html> Excellent!!!
>> >>> Thanks so much Steve.
>> >>> I hope you have a great day!
>> >>>
>> >>> Richard Hatano
>> >>> EDA Manager
>> >>>
>> >>> 3855 Ruffin Road, San Diego, CA 92123-1813 USA Direct 858-285-2392
>> >>> | Fax 858-836-3400 [log in to unmask]
>> >>>
>> >>>
>> >>> -----Original Message-----
>> >>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
>> >>> Sent: Monday, May 3, 2021 9:56 AM
>> >>> To: [log in to unmask]
>> >>> Subject: Re: [TN] TechNet archives? looking for information on
>> >>> coating
>> >>> or encapsulation long term protection
>> >>>
>> >>> EXTERNAL SENDER – Exercise Caution.
>> >>>
>> >>>
>> >>>
>> >>> Hi Richard,
>> >>>
>> >>> It's still there, check out:
>> >>>
>> >> https://urldefense.com/v3/__https://ddei5-0-ctp.trendmicro.com:443/
>> >> wis/clicktime/v1/query?url=http__;!!MvWE!
>> >> QpdoFk1dEwfz9s-0RU8XvpCowu4mHaHeOOF0Xh3k9rcaMD4eKPxhH5rV3edjmczM1w$
>> >>> s%3a%2f%2furldefense.com%2fv3%2f%5f%5fhttps%3a%2f%2fddei5%2d0%
>> >>> 2dctp.tr
>> >>> endmicro.com%3a443%2fwis%2fclicktime%2fv1%2fquery%3furl%3dhttps%
>> >>> 2a3a%2
>> >>> a2f%2a2flinkprotect.cudasvc.com%2a2furl%2a3fa%2a3dhttp%2a253a%
>> >>> 2a252f%2
>> >>> a252flistserv.ipc.org%2a252fscripts%2a252fwa.exe%2a253fINDEX%2a26c
>> >>> %2a3
>> >>> dE%2a2c1%2a2c%2a2d%
>> >>> 2a5fjKsmkPzskGmh426O6bq8UU5N5sxYZ8e0MOY0D1SPtmrYUHQ
>> >>> wzmiQGij5%2a5fWcIr%
>> >>> 2a5fNtyKbi4kVnCsYNz0wRb4i5NIsOGttWtHS4XSD5kovZnBv8S
>> >>> fgrWHI3l4%2a26typo%2a3d1%26umid%3dE6764D8F%2dC16F%2dE005%2d9F9E%
>> >>> 2d165A
>> >>> B66417E9%26auth%3dfa0282dc3c44b189bcc708f19c936975d8469bfe%
>> >>> 2d553ee3487
>> >>> 38739e35723801315099f645a03cc41%5f%5f%
>> >>> 3bJSUlJSUlJSUlJSUlJSUlJSUlJSUlJQ
>> >>> %21%21MvWE%21VIfdjJP8qX%2dnpQY%2dAPqU1vxX8G2bS9Fro3BnE%
>> >>> 5fY8QPmrzarqhgG
>> >>> eWwxLlwkZ8YjqBQ%24&umid=A48E7829-
>> >>> C174-0705-8E4D-18D4D584F493&auth=fa02
>> >>> 82dc3c44b189bcc708f19c936975d8469bfe-93521325a05f21120d94d331f5d3669
>> >>> fa
>> >>> 7e482e7
>> >>>
>> >>> Steve
>> >>>
>> >>> On Mon, May 3, 2021 at 10:52 AM Richard Hatano
>> >>> <[log in to unmask]
>> >>>>
>> >>> wrote:
>> >>>
>> >>>> Hi,
>> >>>>
>> >>>> Sorry to trouble, but I just discovered that the IPC homepage no
>> >>>> longer seems to have a link to the online forum archives (maybe I
>> >>>> haven't checked in quite a while!).
>> >>>> Are they now behind a registration wall?
>> >>>> I was looking for information on best encapsulants (coatings aren't
>> >>>> looking capable) to provide 100 year protection to passive
>> >>>> circuitry
>> >>>> that will be buried approx. 3-8 ft. underground inside a
>> >>>> polypropylene
>> >>> enclosure.
>> >>>> I hope everyone is doing well and send thanks if anyone can help
>> >>>> point me in the right direction.
>> >>>>
>> >>>> Richard Hatano
>> >>>> EDA Manager
>> >>>> [logo]
>> >>>> 3855 Ruffin Road, San Diego, CA 92123-1813 USA Direct
>> >>>> 858-285-2392
>> >>>> | Fax 858-836-3400
>> >>>> [log in to unmask]<mailto:[log in to unmask]>
>> >>>>
>> >>>
>> >>>
>> >>> --
>> >>> Steve Gregory
>> >>> Kimco Design and Manufacturing
>> >>> Process Engineer
>> >>> (208) 322-0500 Ext. -3133
>> >>> Cell Phone: (918) 706-2779
>> >>>
>> >>> --
>> >>>
>> >>>
>> >>>
>> >>> This email and any attachments are only for use by the intended
>> >>> recipient(s) and may contain legally privileged, confidential,
>> >>> proprietary or otherwise private information. Any unauthorized use,
>> >>> reproduction, dissemination, distribution or other disclosure of the
>> >>> contents of this e-mail or its attachments is strictly
>> >>> prohibited. If
>> >>> you have received this email in error, please notify the sender
>> >>> immediately and delete the original.
>> >>>
>> >>> <p></p>
>> >>>
>> >>
>> >> <p></p>
>> >>
>>
>
|
