Hi Ed
It may seem logical to carry out the masking to save money. However,
from my experience in our coating service you should leave it to the
experts. The reality is Parylene masking can be very, very challenging.
Better to avoid the recriminations at the end of it if the masking fails
and the fingers start to point.
Let Lloyd take the responsibility, he's got broad shoulders ;-)
Best Regards
Dr Lee Hitchens
SCH Technologies is a Division of SCH Services Limited
Mob: +66 (95) 418 5931
www.conformalcoating.co.uk
Skype: leehitchens
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On 20/03/2017 23:52, Ed Popielarski wrote:
> You could do the masking yourself to reduce cost.
>
> Ed Popielarski
> Engineering Manager
>
>
> 970 NE 21st Ct.
> Oak Harbor, Wa. 98277
>
> Ph: 360-675-1322
> Fx: 206-624-0695
> Cl: 360-544-2289
>
>
>
> “It's one kind of victory to slay a beast, move a mountain, and cross a chasm, but it's another kind altogether to realize that the beast, the mountain, and the chasm were of your own design.”
> https://goo.gl/maps/mMjg43rXeFB2
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
> Sent: Monday, March 20, 2017 9:51 AM
> To: [log in to unmask]
> Subject: Re: [TN] WG: [TN] Screen On Insulation
>
> Bob,
>
> I've used SCS in Indianapolis, but they have many other branches.
>
> Is a batch process. Cost is in masking, if required. Typically, the labor intensive part.
>
> Call them and find out
>
> Steve
>
> https://scscoatings.com/
>
>
> On Mon, Mar 20, 2017 at 12:46 PM, lduso - Diamond-MT.com < [log in to unmask]> wrote:
>
>> Bob
>>
>> Considering parylene is all done by batch process, pricing has a much
>> to do with that batch size, The largest effect on cost is the prep
>> time. Masking is labor time and that is costly. Parylene materials are
>> pricey but not outrageous. Let me know if you want more details.
>>
>> Lloyd Duso
>> Plant Manager
>> Diamond-MT
>> (814) 535-3505
>> www.Diamond-mt.com
>>
>> On Mon, Mar 20, 2017 at 12:05 PM, Robert Kondner <
>> [log in to unmask]>
>> wrote:
>>
>>> Torsten,
>>>
>>> Do you know how thick a parylene coating is? My recollection is
>>> pretty thin.
>>>
>>> So I checked, very high dielectric strength, thickness typically
>>> under 1 mil but it can be built up further with longer processing time.
>>>
>>> Any idea wat coating with parylene cost for a small batch of boards?
>>>
>>> Thanks,
>>> Bob Kondner
>>>
>>>
>>> -----Original Message-----
>>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Torsten Hagge
>>> Sent: Monday, March 20, 2017 9:17 AM
>>> To: [log in to unmask]
>>> Subject: [TN] WG: [TN] Screen On Insulation
>>>
>>> Hi,
>>>
>>> cheap solution could be a 1mil kapton tape with the mention risk of
>>> air gaps, fine and cost expensive solution parylene HT coating
>>> before
>> placing
>>> the ferrite cores...
>>>
>>> Take care
>>> Torsten
>>>
>>>
>>>
>>> Best Regards
>>>
>>> KRISTRONICS GmbH
>>>
>>> Dipl.Ing. (FH) Torsten Hagge
>>> team leader HW development
>>> Gewerbegrund 5-9
>>> 24955 Harrislee
>>> Telefon +49 (0) 461 7741-624
>>> Telefax +49 (0) 461 7741-642
>>> [log in to unmask]
>>> www.kristronics.de
>>> Place of jurisdiction: Flensburg, commercial register: HRB 1433 FL
>>> CEO Dipl.-Ing. oec. Thormod Ohm VAD-Id DE 811182059 Bank account:
>>> Deutsche Bank AG Flensburg, account 4216610, bank number
>>> 21570011
>>> IBAN: DE32 2157 0011 0421 6610 00, BIC: DEUT DE HH 215 P Please
>>> consider the environment before printing this e-mail
>>>
>>>
>>>
>>> -----Ursprüngliche Nachricht-----
>>> Von: TechNet [mailto:[log in to unmask]] Im Auftrag von Robert Kondner
>>> Gesendet: Freitag, 17. März 2017 21:11
>>> An: [log in to unmask]
>>> Betreff: [TN] Screen On Insulation
>>>
>>> Hi,
>>>
>>>
>>>
>>> We have a PCB that turns out to require 2500VAC test for 60 seconds
>>> and
>> we
>>> had some flash over on pads to vias. We also have a planar ferrite
>>> transformer with primary windings on one side.
>>>
>>>
>>>
>>> Does anyone know of a screen on insulation material that can be used
>>> to increase flash over voltages? I would like to get a 2 or 3 mils
>>> of
>> material.
>>> My other option is to have a laser cut layer of isolation but that
>>> could leave air paths under the material.
>>>
>>>
>>>
>>> Any other ideas welcome.
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Bob K.
>>>
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