MIL-DTL-87104C
4.6.4.11.2.2 Semi-flexible coaxial assembly. The test sample shall be securely mounted at one end and then
contoured such that the cable contacts approximately 20 percent of the circumference of the squirrel cage. A three-
pound weight shall be freely suspended from the other end of the cable to insure constant contact with the squirrel
cage. The sample shall be subjected to 20 ± 2 oscillations per minute (an oscillation shall consist of 5 bars travel
forward and backward from a given point). The test sample shall be examined to insure that the outer conductor has
not been penetrated by the abrasive action. At the conclusion of the examination, the assembly shall be subjected to
the leakage (contaminants) test, procedure III (see 4.6.4.13.3) and the corona-high potential test (see 4.6.2.4).
4.6.4.11.3 Accept-reject criteria (see 3.5.3.13).
4.6.4.11.3.1 Flexible assembly. If any bar of the squirrel cage abrasion tester comes in contact with any conductor
of the sample prior to the completion of 500 oscillations, the cable shall be considered as having failed this test.
4.6.4.11.3.2 Semi-flexible assembly. If the assembly fails to meet the accept-reject criteria of 4.6.4.13.3.3 and
4.6.2.4.3, the assembly shall be considered to have failed this test.
4.6.4.12 Chemical resistance test (see 3.5.3.14). The chemical resistance test shall determine the assembly's
resistance to corrosive materials. The test simulates the exposures experienced during normal service life.
4.6.4.12.1 Test apparatus. The apparatus used to perform this test shall consist of the following:
a.
Exposure chamber with adequate ventilation and suitable containers for the required chemical materials.
Controlled container: Heating means capable of maintaining the temperature ± 2°C throughout the range
b.
of 32.2°C to 65.6°C.
c.
Racks for air-drying test units.
4.6.4.12.1.1 Chemical materials. The chemical solutions and fluids used in this test and their specified test
temperatures shall be as follows:
Solution or fluid
Reference document
Test temperature
37.8°C ± 5°C
a. JP-4 or JP-5 fuel
37.8°C ± 5°C
b. Hydraulic fluid
60°C ± 5°C
c. Cleaner/brightener
---
60°C ± 5°C
d. Epoxy stripper
WARNING: Toxic materials are used in this procedure that may be harmful to health if
suitable safety precautions are not taken.
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