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Dielectric Strengths for Insulators

Dielectric strength: below

Dielectric strength in kilovolts per inch (kV/in):

Material*Dielectric Strength
Air20 to 75
Porcelain40 to 200
Paraffin Wax200 to 300
Transformer Oil400
Bakelite300 to 550
Rubber450 to 700
Glass2000 to 3000

* = Materials listed are specially prepared for electrical use, above.

Lessons In Electric Circuits copyright (C) 2000-2020 Tony R. Kuphaldt, under the terms and conditions of the CC BY License.

See the Design Science License (Appendix 3) for details regarding copying and distribution.

Revised July 25, 2007

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