A four rod embedded electrode test

It has been amply demonstrated (1, 2, 3) that exposure to oxygen-containing environments above temperatures of 150°C will cause most of the commonly used electrical insulating materials to deteriorate (see Figure 1). Since many of these insulations are used in hermetic structures, life test data based on air aging could be misleading. The emphasis on space electronics in present-day technologies must also place important stress on performing measurements in a closely controlled environment simulating space conditions.