Temperature cycling can cause rapid degradation of wire/cable insulation integrity. This can manifest and insulation splits, cracks, and/or delamination. Often an overlooked test method for assessment, the thermal shock test proves and excellent means of assessing the construction quality of a wire or cable.
The test focuses on a single high-temperature to low-temperature exposure and the impact this can have on the wire insulation. Lower-quality materials and constructions will fail quickly with this assessment technique.
Parameters that can be adjusted for this test include:
Number of Specimens
Post-test Analysis (pass/fail conditions)
Perform visual examination of the specimen. Record any observed defects.
Perform insulation voltage withstand test on the specimen to specified voltage. Note any failed specimen.
Wrap specimen around mandrel and place into oven for specified duration.
After removal from the oven, place the specimen into the low-temperature freezer for specified duration.
Remove specimen from the freezer and perform a visual examination of the specimen. Note any insulation cracks or defects.
Report the elevated exposure temperature and duration, low-temperature freezer temperature and specimen exposure duration, and any observed insulation defects.