MIL-DTL-3432J
4.7.8.2 Procedure. The jacketed cable specimens and the insulated conductor specimen shall be aged in an air
oven for 48 hours, 30 minutes at 71± 2°C, removed from the oven, and allowed to cool to room temperature. Aged
specimens selected for checking inked markings and cables as a whole, shall be attached to the proper size mandrel
as determined in 4.7.8.2.1. The specimens selected for checking insulation apart from the cable shall have the jacket
removed and one of each differently colored insulated conductor shall be attached to the proper size mandrel as
determined in 4.7.8.2.1. The specimens shall be suspended vertically with lower ends weighted sufficiently to keep
specimens taut and to permit bending them without handling. The mandrel and specimens shall be placed in the cold
chamber at the lower temperature ± 2°C specified in table II, for a minimum of 4 hours. While at this temperature, the
jacketed cable specimens shall be bent for 6 close turns, one turn for polyethylene insulation, around the mandrels at
the rate of 15 - 18 turns per minute. The insulated conductor specimens (shielding or non-adhering color coding
removed) shall be bent at the rate of one turn per second. If six turns cannot be obtained from a specimen because
its length is restricted by space limitations in the cold chamber, the number of turns obtainable from a 5-foot
specimen shall be permitted. After the test has been completed, the jacket on the specimens of cable shall be
examined using a magnifying glass of at least 3X magnification and then removed. The conductor insulation on all
specimens shall be examined for cracks using the same power magnifying glass.
4.7.8.2.1 Mandrels. The mandrel shall be of a standard size in one of the diameters (in inches) specified in table
XVIII. The standard size selected shall be the largest size that does not exceed the value computed in table XIX,
except that the .062 inch (1.57mm) mandrel shall be used when a smaller size is indicated by the computation.
TABLE XVIII. Mandrel diameters.
Inch/(mm)
Inch/(mm)
Inch/(mm)
Inch/(mm)
.062/(1.57)
.500/(12.70)
1.90/(48.3)
5.56/(141.2)
.094/(2.39)
.680/(17.27)
2.38/(60.5)
6.63/(168.4)
.125/(3.18)
.840/(21.34)
2.88/(73.2)
8.63/(219.2)
.188/(4.78)
1.050/(26.67)
3.50/(88.9)
10.75/(273.1)
.250/(6.35)
1.310/(33.27)
4.00/(101.6)
.375/(9.53)
1.660/(42.16)
4.50/(114.3)
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