Hi,

 I had looked at solder mask materials but the dielectric strength of solder
mask materials seemed a little low.

 For example the Red GLPT has a 3000V per mil rating which seem rather high.
I was wondering of we could silk screen that stuff but I figured someone
already went through this process of material identification.

 If I could get a good consistent 2 mil layer of Red GLPT that would be
pretty good. Anything elsew out there folks could suggest.

Thanks,
Bob K.

-----Original Message-----
From: Ramon Essers [mailto:[log in to unmask]] 
Sent: Friday, March 17, 2017 4:17 PM
To: [log in to unmask]
Subject: Re: [TN] Screen On Insulation

Please take a look at the IPC-SM-840 standard.

(Send on The road with iPhone)

> Op 17 mrt. 2017 om 21:10 heeft Robert Kondner <[log in to unmask]>
het volgende geschreven:
> 
> 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.