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  

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-----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.