MIL-DTL-55446D
4.4.3.1 Tensile strength. A specimen of the jacket shall be tested in accordance with method 3021 of
4.4.3.2 Elongation. A specimen of the jacket shall be tested in accordance with method 3031 of
4.4.3.3 Aged elongation. Oven-age a specimen of the jacket for 48 hours at 120±2 °C and then test
in accordance with method 4001 of FED-STD-228.
4.4.3.4 Heat shock. Wind six close turns of a finished cable around a mandrel and fasten the ends
securely to the mandrel. The diameter of the mandrel shall be three times the overall diameter of the
cable for all cables under .75 inch (19 mm). For cables .75 inch (19 mm) and larger, the mandrel
diameter shall be eight times the overall diameter of the cable. Place the cable on the mandrel in an oven
maintained at 120±2 °C for a period of 1 hour. Remove from the oven and allow to cool to room
temperature, then, remove the cable from the mandrel and straighten. Slit the jacket lengthwise and
remove from the core. Examine the jacket to verify that there are no visible cracks to the unaided eye.
4.4.3.5 Cold bend. Condition a sample of finished cable in a cold box at 18±2 °C for 24 hours.
After the 24 hours of exposure, remove the sample from the cold box and immediately bend it 180
degrees around a mandrel of the size specified below at a uniform rate of bend. Complete the bending
within 10 seconds. Examine the jacket to verify that there are no cracks visible to the unaided eye.
Number of conductors
Mandrel diameter inches (mm)
8 - 13
.5 (12.70)
14 - 24
1.5 (38.10)
25 - 65
2.0 (50.80)
66 - 109
2.5 (63.50)
110 - 205
4.0 (101.60)
206 - 305
8.0 (203.20)
306 - 405
12.0 (304.80)
4.4.3.6 Flammability. Expose a sample of the jacket to a Bunsen burner flame for 15 seconds in a
draft-free area. Remove the Bunsen flame and verify that the jacket flame goes out within 5 seconds.
Repeat three times at 15-second intervals to verify that the jacket is self-extinguishing and does not
continue to burn.
4.4.3.7 Jacket stripping. Pull the ripcord to cut a section of the jacket. Remove the jacket to
determine that it skins freely and clearly.
4.4.4 Visual and dimensional inspection. Inspect the finished cable to verify that the materials,
dimensions, and all workmanship comply with this specification. Certification as to the materials and
splices may be accepted at the option of the Government.
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