[SI-LIST] Re: breakdown voltage (arching) equation
- From: Chris Padilla <cpad@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 04 Nov 2003 10:54:55 -0800
Gus,
I am looking at an Appendix in an old EM book from college and it gives a
small table of materials with their Dielectric Constant (er) and Dielectric
Strength given in Volts per meter (V/m) units.
er Strength (V/m)
Barium titanate 1200 7.5e6
Water (sea) 80 ~
Water (distilled) 81 ~
Nylon 8 ~
Paper 7 12e6
Glass 5-10 35e6
Mica 6 70e6
Porcelain 6 ~
Bakelite 5 20e6
Quartz (fused) 5 30e6
Rubber (hard) 3.1 25e6
Wood 2.5-8.0 ~
Polystyrene 2.55 ~
Polypropylene 2.25 ~
Paraffin 2.2 30e6
Petroleum oil 2.1 12e6
Air (1 atm.) 1 3e6 (76.2 V/mil)
I hope these columns come out legible for you and answer your question. I
don't know the breakdown for FR-4 but I suspect it is in the Glass/Mica
range and perhaps a magnitude better than air.
----->Chris
At 08:03 AM 11/4/2003 -0800, gustavo.duenas@xxxxxxxxxxx wrote:
>Hello all ,
>
>Does anyone know of an equation that relates breakdown voltage (arching) vs
>distance in a given dielectric medium, metal types ,etc?
>I looked in Henry Ott's book but did not find an equation.
>
>Thanks in advance,
>
>Gus
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