MIL-C-47244A (MI)
4.6.7 Humidity and heat resistance. Two test panels shall be placed in a
temperature-humidity chamber and subjected to the relative humidity level and
temperature cycling as specified in 3.3.7. At the conclusion of the test period, the test
panels shall be visually examined, weighed, and measured to ensure compliance with
the requirements of 3.3.7.
4.6.8 Tread resistance. One test panel shall be placed in a temperature chamber
and shall be subjected to a temperature of 88º ± 3ºC for not less than 72 hours. The
test panel shall be transferred directly from the temperature chamber to the platen of a
Link spring checker, or equivalent, and a 0.75 inch thick by 3 inch diameter elastomer
disk conforming to MIL-R-6855, class 2, grade 70, shall be positioned on the test panel
as shown in figure 2. A force of 200 ± 10 pounds shall be applied to the disk. With
the disk held rigid, the test panel shall be twisted approximately 45 degrees clockwise,
then approximately 90º counter clockwise, followed by approximately 45º clockwise.
At the conclusion of the test, the resin system shall be examined and shall show no
evidence of surface degradation or loss of adhesion.
4.6.9 Low temperature impact resistance. Two test panels shall be placed in a
temperature chamber and stabilized at -54º ± 3ºC. The test panels, while at this
temperature, shall be tested for impact resistance. A steel ball weighing 0.5 pound
shall be dropped from successively increasing heights in one foot intervals, starting at
one foot until a height of 20 feet is attained. At the conclusion of the test, the resin
system shall be examined and shall show no evidence of shattering or fracture.
4.6. Flammability. The cured system shall be tested for flammability in
accordance with ASTM D 568. The cured resin system shall be self-extinguishing by
this test.
4.6.11 Hydrocarbon resistance.
4.6.11.1 Resistance to hydraulic oil. Two test panels shall be half immersed in
hydraulic oil conforming to MIL-H-5606 for not less than 55 minutes nor more than 65
minutes. Upon removal, excess oil shall be wiped from the test panels. A standard
0.375 inch Bunsen burner with air ports open to produce a blue flame approximately 1
inch high shall be placed under the test panel and adjusted so that the flame tip is just
in contact with the portion of the resin system that had been immersed. At the end of
30 seconds the flame shall be removed and the test panel allowed to burn. In case the
test panel does not continue to burn after the first ignition, the burner shall be placed
under the test panel for a second period of 30 seconds immediately after the resin
system ceases to burn. A stop watch shall be started when the flame is removed and
the time elapsing before the resin system extinguishes itself shall be measured.
Burning time shall be not more than 2 seconds.
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