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Dielectric Strength of Insulators – Key Data for Electrical Engineers

Dielectric Strength (kV/in) measures the maximum electric field a material can withstand before breakdown. Below are industry‑standard values for common insulators, expressed in kilovolts per inch (kV/in). These figures are derived from IEC and IEEE guidelines for materials specially prepared for electrical use.

Material* Dielectric Strength (kV/in)
Vacuum20
Air20 to 75
Porcelain40 to 200
Paraffin Wax200 to 300
Transformer Oil400
Bakelite300 to 550
Rubber450 to 700
Shellac900
Paper1250
Teflon1500
Glass2000 to 3000
Mica5000

* Materials listed are specially prepared for electrical use.

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