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Dielectric Strength - ASTM D149 Plastic Test Standard

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Dielectric Strength - ASTM D149

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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.

Similar Standards

IEC 60243-1

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