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Thermal Shock

Thermal FOR: Insulation $1,970

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:

Procedure

  1. Perform visual examination of the specimen. Record any observed defects.
  2. Perform insulation voltage withstand test on the specimen to specified voltage. Note any failed specimen.
  3. Wrap specimen around mandrel and place into oven for specified duration.
  4. After removal from the oven, place the specimen into the low-temperature freezer for specified duration.
  5. Remove specimen from the freezer and perform a visual examination of the specimen. Note any insulation cracks or defects.
  6. Report the elevated exposure temperature and duration, low-temperature freezer temperature and specimen exposure duration, and any observed insulation defects.

Covered specifications

  • AS22759 Paragraph 5.7.4
  • AS4373 Method 805
  • AS39029 Method 4.7.7
  • AS6070 Method 5.5.2
  • AS81044 Method 4.7.5.17
  • AS85485 Method 5.25
  • ASTM D3032 Section 21
  • EN3475 Method 404
  • MIL-DTL-25038 Method 4.6.12
  • MIL-DTL-32554 Method 4.6.2
  • MIL-DTL-32630 Method 4.7.9
  • MIL-DTL-49055G Method 4.7.7
  • MIL-PRF-55514 Method 4.8.19.1
  • MIL-STD-202 Method 107
  • MIL-STD-2223 Method 4004
  • MIL-STD-810 Method 510
  • NEMA 27500 Method 4.3.9
  • BSS7324 Method 7.51
  • MIL-PRF-39018 Method 4.6.16
  • MIL-STD-810 Method 503.7
  • MIS-41167T Method TS-C
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