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From: D from BC on 11 Mar 2010 18:34
I'm trying to find the breakdown V for
0.0028 inches of PTFE (teflon) and 0.004 inches (~100um) of Kapton.


--
D from BC
British Columbia
From: D from BC on 11 Mar 2010 18:58
In article <MPG.26031df83dfd3e959896e3(a)209.197.12.12>,
myrealaddress(a)comic.com says...
>
> I'm trying to find the breakdown V for
> 0.0028 inches of PTFE (teflon) and 0.004 inches (~100um) of Kapton.

Found
http://www.orionind.com/kapton.PDF
dielectric strength tests for Kapton thickness.
0.3um is 3000 AC V/mil
0.5um is 3000 AC V/mil
1.0um is 6000 AC V/mil
2.0um is 5000 AC V/mil <<< went down??
3.0um is 4500 AC V/mil << gets worse when thicker?
5.0um is 3000 AC V/mil << same as much thinner 0.3um!

I guess 100um of Kapton is about 3000 AC V/mil.

From: Joerg on 11 Mar 2010 19:27
D from BC wrote:
> I'm trying to find the breakdown V for
> 0.0028 inches of PTFE (teflon) and 0.004 inches (~100um) of Kapton.
>

Not quite the thickness you need but regarding Kapton I bet you could
obtain more info from Dupont:

http://zodiaq.fr/Kapton/en_US/assets/downloads/pdf/CR_H-54506-1.pdf

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
From: whit3rd on 12 Mar 2010 14:54
On Mar 11, 4:27 pm, Joerg <inva...(a)invalid.invalid> wrote:
> D from BC wrote:
> > I'm trying to find the breakdown V for
> > 0.0028 inches of PTFE (teflon) and 0.004 inches (~100um) of Kapton.

Textbook value for PTFE aka TFE aka Teflon is 480 volts per milli-
inch,
and for polyimide/Kapton is 560 volts per milli-inch.

That assumes pure material, clean surfaces, and no conduction
enhancement from ambient light...
This data, from _The_Practicing_Scientist's_Handbook_, Moses, Alfred
J.,
1978 edition...
From: D from BC on 12 Mar 2010 18:19
In article <fa8a0108-f3dc-45a0-bdfa-04d8601470d5
@o3g2000yqb.googlegroups.com>, whit3rd(a)gmail.com says...
>
> On Mar 11, 4:27�pm, Joerg <inva...(a)invalid.invalid> wrote:
> > D from BC wrote:
> > > I'm trying to find the breakdown V for
> > > 0.0028 inches of PTFE (teflon) and 0.004 inches (~100um) of Kapton.
>
> Textbook value for PTFE aka TFE aka Teflon is 480 volts per milli-
> inch,
> and for polyimide/Kapton is 560 volts per milli-inch.
>
> That assumes pure material, clean surfaces, and no conduction
> enhancement from ambient light...
> This data, from _The_Practicing_Scientist's_Handbook_, Moses, Alfred
> J.,
> 1978 edition...

Huh.. That's wayyyy different than what's on the link that Joerg
provided.
http://zodiaq.fr/Kapton/en_US/assets/downloads/pdf/CR_H-54506-1.pdf

Table 2
Kapton Type 150 FCR Polyimide film 1.5 mil : 4400V/mil

Table 1
Kapton Type 100 CR Polyimide Film 1mil: 7400V/mil

I supppose it depends on the type of polyimide.
Perhaps the withstand test is differant.

According to (blows dust off book :O === ***)
Reference Data for Engineers 1993
Polyimide: 570 V/mil << Not far from your book.

However..
On ebay item 180431395463 Kapton film
1mil Kapton + 1.4 mil silicone adhesive has breakdown at 6000V !

Ebay item 330275429870
1mil Kapton + 2mil mil silicone adhesive has breakdown at 7500V!

Either silicone adhesive has an impressive breakdown or the Kapton
breakdown is higher than the polyimide spec in text books.

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