MIL-DTL-25038J
a. Specimen No. 2:
Aviation gasoline conforming to ASTM D910, grade 100LL.
Hydraulic fluid conforming to MIL-PRF-5606 at 120±2 °F.
b. Specimen No. 3:
Turbine fuel conforming to either MIL-DTL-5624, grade JP-4, or to
c. Specimen No. 4:
MIL-DTL-83133, grade JP-8, at room temperature.
Lubricating oil conforming to MIL-PRF-7808, at 120±2 °F.
d. Specimen No. 5:
e. Specimen No. 6
Hydraulic fluid conforming to SAE AS1241.
Lubricating oil conforming to MIL-PRF-23699, at 120±2 °F.
f. Specimen No. 7:
MIL-DTL-12468, at room temperature (see 4.6.4c).
g. Specimen No. 8:
MIL-DTL-12468, at room temperature (see 4.6.4c).
h. Specimen No. 9:
During the immersion, the bend in each specimen shall have a diameter no greater than 40 times the
diameter of the specimen. Upon removal from the fluid, the specimen shall be wiped with a clean cloth
and shall remain not less than 1, nor more than 2 hours, in free air at room temperature. After that time,
the specimen shall be subjected to and pass the bend test specified in 4.6.5 without failure, followed by
the wet dielectric test specified in 4.6.6 Failure of the test specimen to pass these tests shall be cause for
rejection.
4.6.8 Cold bend. A revolving mandrel capable of being operated from outside the cold chamber shall
be used. The mandrel diameter and the test load shall be as specified in the applicable specification
sheet. One end of each specimen shall be secured to the mandrel and the other end weighted. The
mandrel and the specimens shall be placed in a cold chamber and the temperature of the chamber
lowered to -65±5 °F. After maintaining this temperature for 4 hours, and while still at this low
temperature, the specimens shall be bent around 180° of the mandrel without opening the door to the
cold chamber. The time required for bending the sample around 180° of the mandrel shall be .5 minute at
a uniform rate of speed. The specimens shall be allowed to return to room temperature, without
straightening, and examined for visual defects. Each specimen shall then be subjected to the wet
dielectric test specified in 4.6.6.
4.6.9 Conductor resistance. Conductor resistance of the finished wire shall be measured in
accordance with method 6021 of FED-STD-228.
4.6.10 Flame resistance.
4.6.10.1 Preparation of specimens. A 24-inch specimen shall have its center 18-inch section
immersed for 24 hours at room temperature in aviation gasoline conforming to ASTM D910, grade 100LL.
A second specimen shall be immersed in a like manner for 24 hours at room temperature in a solution of
aircraft lubrication oil conforming to SAE J1966, grade 1100. A third specimen shall be suspended for
4 hours in the vapors of aircraft lubricating oil conforming to SAE J1966, grade 1100, which shall be
maintained at a temperature of 250 °F. Upon removal of the specimens from the liquid and after wiping
with a clean cloth, wire bands consisting of one turn of wire, no larger than size 30, shall be wrapped
around each specimen, designating its 7- inch (178 mm) middle section, plus an additional outer band 4
inches (102 mm) outside each of these two bands.
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