D1830-17 – Standard Test Method Technical Guide

📐 Scope and Applicability of the Standard

ASTM D1830 – 17 (Reapproved 2024) provides a procedure for evaluating the thermal endurance of flexible sheet materials used for electrical insulation. The method determines the dielectric breakdown voltage at room temperature after aging in air at selected elevated temperatures. The thermal endurance is expressed in terms of a temperature index.

Applicable materials include solid electrical insulating materials such as coated fabrics, dielectric films, and composite laminates where the retention of flexibility after heat aging is of major importance. Per Section 1.3, this test method is not intended for rigid laminate materials. All values are stated in acceptable metric units as the standard.

🧪 Test Procedure and Temperature Index Determination

The aging procedure utilizes forced-convection laboratory ovens conforming to ASTM D5423. Specimens are aged in air at selected elevated temperatures. After aging, the specimens are evaluated using the curved electrode method to measure the dielectric breakdown voltage. The life test data is analyzed statistically as defined in IEEE No. 101A. The temperature index is derived by extrapolating the Arrhenius plot of life versus temperature to a specified time, usually 20,000 hours.