not sure if it will work or not..
https://www.cslsilicones.com/en/explore-by-sector/manufacturing-industrial/item/high-voltage-insulator-coating.html
there are alumina filled UV cure epoxy (thermal/UV dual cure), but not ad
as high voltage insulator. it should be better than silicone, IMHO... but
you better get approved material as listed above.
> Hi Bob,
>
> parylene is closed at about 0,6µm, so at 1 mil you have a safety margin
> of about 4200 %.
>
> We have payed about 1500€ for a batch of 32pcs bio sensor PCBs with 40mm
> diameter...
>
> 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
> Please consider the environment before printing this e-mail
>
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: Robert Kondner [mailto:[log in to unmask]]
> Gesendet: Montag, 20. März 2017 17:06
> An: 'TechNet E-Mail Forum'; Torsten Hagge
> Betreff: RE: [TN] WG: [TN] Screen On Insulation
>
> 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
> 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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