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.
|
