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Dielectric Strength - ASTM D149
Voltage per unit thickness at which a material will conduct electricity. The higher the value, the more electrically insulating a material is.
The test material is placed between two electrodes. Voltage is applied in a specified manner until the material experiences dielectric breakdown, an electrical burn-through (puncture) of the test specimen. Testing is performed using one of three methods as outlined below.
| Method | Name | Description |
|---|---|---|
| A | Slow Rate-of-Rise | Voltage is increased at a uniform rate until dielectric breakdown of material. |
| B | Short-Time | Voltage is increased from 50% of the breakdown voltage to the breakdown voltage at a uniform rate until dielectric breakdown of the material. |
| C | Step-by-Step | Voltage is increased from 50% of the breakdown voltage in equal increments for a specified time until dielectric breakdown of the material. |