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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by Jake Hertz
by Jake Hertz
by Jake Hertz
