MIL-DTL-87104C
d.
The bunsen burner shall have a .25 inch (6.4 mm)-inlet, a normal bore of .375 inch (9.53 mm) and a length
of approximately 4 inches (101.6 mm) from top to the primary inlets.
e.
The burner shall be so adjusted that the hottest portion of the flame is applied to the test sample.
4.6.4.8.3 Accept-reject criteria (see 3.5.3.10). If the non-metal components of the assembly are damaged or are
not extinguished within 6 seconds after removal of the flame, the assembly shall be considered as having failed the
flammability test.
4.6.4.9 Heat aging and cold bend test (see 3.5.3.11). The heat aging and cold bend test shall determine the ability
of the assembly to withstand heat aging and cold bending that may be applied during in-service and maintenance
periods.
4.6.4.9.1 Test setup.
4.6.4.9.1.1 Test equipment. Temperature chambers, a mandrel, and related instruments as applicable, shall be
required.
4.6.4.9.1.2 Test conditions. Tests shall be conducted under room ambient conditions (see 4.3.1.1), except that the
temperature shall be as specified under 4.6.4.9.2.
4.6.4.9.2 Procedure.
The test sample shall be suspended in a pre-heated test oven at 200°C ± 5°C.
a.
b.
Heated air at atmospheric pressure shall be so circulated to maintain a uniform temperature in the oven.
c.
The test sample shall be conditioned for a period of 7 days.
d.
After this conditioning period, the test sample shall be removed from the oven and conditioned at room
temperature (see 4.3.1.1) for a minimum of 4 hours.
e.
After this conditioning, one end of the test sample shall be clamped circumferentially at two points,
approximately 45 degrees apart, to a mandrel whose diameter is 10 times that of the test sample.
f.
The test sample shall then be wrapped around the mandrel for one full turn.
The mounted sample shall be suspended in a pre-chilled cold chamber of -55°C ± 2°C and conditioned for
g.
20 hours.
h.
After this conditioning, but while the test sample is still in the cold chamber at the conditioning temperature,
the sample shall be wrapped for three close turns (two close turns for cables having a diameter of 0.500 in.
(1.27 cm) and greater) around the mandrel at a uniform rate of 15 ± 3 revolutions per minute, preferably by
means of a electrically driven motor.
i.
The test sample shall be guided by a free-moving sheave or transversing device in the intimate contact with
the cable at the initial point of bend.
j.
The test sample shall then be removed from the cold chamber and allowed to stabilize (see 4.3.1.3) at
room ambient conditions.
k.
The test sample shall then be visually examined for evidence of signs of cracks or flaws in the cable.
l.
After this examination, the test sample shall be subjected to the leakage (contaminants) test, procedure III
(see 4.6.4.13.3).
m. After the leakage test, the assembly shall be subjected to the corona-high potential test (see 4.6.2.4).
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