MIL-DTL-13169E
4.3.2.1.5 Tear resistance. Apparatus and procedure shall be as specified in method 3111 of FED-
STD-228. The specimens shall be cut and buffed from a section of the jacket under test except as
indicated in 4.3.2.1.
4.3.2.1.6 Thin-walled jackets. For tear resistance tests of jackets having an allowed minimum
thickness of less than 0.040 inch (1.02 mm), specimens may be cut from sheets specified in 4.3.2.1.
Specimens shall be cut so that tear will occur in the direction of the calendar or mill grain.
4.3.2.1.7 Molded sheets. Molded sheets of 0.075 to 0.085 inch (1.9 to 2.2 mm) thick may be
furnished for certain tests of small size cables when authorized in 4.3.2.1. The stock of these sheets shall
be taken from the same batch as the insulation or jacket they represent. The sheets shall be at the same
state of cure as the insulation or jacket that they represent. The state of cure shall be considered to be
the same if the tensile stress of the sheet at 200 percent elongation is within 20 percent of that of the
insulation or jacket it represents. The sheets shall be marked to show the direction of calendar or mill
grain.
4.3.2.2 Cold bend. One specimen of each color of finished wire shall be attached to a mandrel .188
inch (4.78 mm) in diameter. The specimen shall be suspended vertically with the lower end weighted
sufficiently to keep the specimen taut and to permit bending without handling. The mandrel and the
specimen shall be conditioned in a low-temperature cabinet for 7 days at 40±2 °C. While at this
temperature, the specimen shall then be bent for 5 close turns around the mandrel at the rate of 15±3
turns per minute. Upon completion of the test, the specimen shall be removed from the cabinet and the
insulation shall be examined for cracks through a magnifying glass of at least 3-diameter magnification.
4.3.3 Dielectric strength. Finished wire shall be tested using method 6111 of FED-STD-228, except
as noted below:
a. The test shall be performed on finished wire only.
b. The test voltage shall be 4,000 V rms and shall be applied between the conductor and the water
for a period of 60 +5, -0 seconds from the time the test voltage is reached.
c.
The source of power shall be not less than 5 kilovolt-amperes capacity.
d. The crest factor of the test voltage shall not differ by more than ±10 percent from that of a
sinusoidal wave when the transformer is loaded with the test specimen.
4.3.4 Insulation resistance. Insulation resistance of the finished wire shall be tested by method 6031
of FED-STD-228, except as noted below:
a. The insulation resistance shall be measured within 2 minutes after the dielectric strength test.
b. The test voltage shall be not less than 125 V nor more than 500 V dc.
c. The polarity of the conductor shall be maintained negative with respect to the water.
d. If the measurement is made at a temperature other than 15.6 °C, the manufacturer shall correct
the measured value of insulation resistance to the resistance at 15.6 °C. If the insulation
resistance is equal to or greater than that required by 3.4.3 when the measurement is made at a
temperature greater than 15.6 °C, no correction factor need be applied. The manufacturer shall
demonstrate that the correction factor is accurate for the compound being used.
e. The insulation resistance test may be terminated in less than 1 minute if the galvanometer has
ceased fluctuating and the reading indicates that a steady insulation resistance value has been
obtained.
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