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.
|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.|