IDES > Resources > Plastic Material Properties > Electrical

Dielectric Strength - ASTM D149 Plastic Test Standard

Apply for Access to 84,000 Datasheets • Share this page

Property information for specific grades of resin are available in the Prospector Plastics Database.
Property Search let's you search for plastics by more than 400 material properties.

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.

Similar Standards

IEC 60243-1

NOTE: Property information for specific grades of resin are available in Prospector Plastics Database.