Dielectric strength in kilovolts per inch (kV/in):
Material* | Dielectric Strength (kV/in) |
Vacuum | 20 |
Air | 20 to 75 |
Porcelain | 40 to 200 |
Paraffin Wax | 200 to 300 |
Transformer Oil | 400 |
Bakelite | 300 to 550 |
Rubber | 450 to 700 |
Shellac | 900 |
Paper | 1250 |
Teflon | 1500 |
Glass | 2000 to 3000 |
Mica | 5000 |
* = Materials listed are specially prepared for electrical use
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