MIL-PRF-20092M
4.5.7 Accelerated aging.
4.5.7.1 Air oven aging. A test specimen and apparatus as specified for the compression resistance test in
4.5.3 shall be used for this test. The specimen shall be subjected to aging in a circulating air oven of the type
specified in ASTM D 573 for 70 + 1/2 hours at 212 + 2°F. After aging, the load required to compress the un-aged
specimen 25 percent shall be applied to the compression resistance apparatus. At least four equal weights shall
comprise this load and the weights shall be added separately at 1-minute plus or minus 2-second intervals. The
percent compression obtained shall be recorded as the compression of the aged specimen. Change in compression
resistance shall then be calculated by the following formula:
Percent of change in compression resistance = X-25 x 100
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Where:
X = percent compression (after aging) when subjected to the
load which was required to produce 25 percent compression on unaged specimen.
This test shall be run in duplicate and the results averaged.
4.5.7.2 Air-pressure heat aging. The cellular material shall be air-pressure aged in accordance with
ASTM D 1055. The specimen shall be visually examined to determine its condition as specified in 3.6.7.2.
Specimens for this test shall be of any convenient size to permit visual examination. Where laminae construction
is employed to achieve specified product thickness, the specimen shall contain the maximum number of cemented
seams, including scrim reinforcement where employed, but in no case less than one.
4.5.8 Burning characteristics. The cellular material shall be tested as specified in appendix A.
4.5.9 Smoke generation tests. Smoke generation tests shall be conducted as specified in appendix A.
4.5.10 Bend fatigue test.
4.5.10.1 Test specimen. The specimen shall be the full specified product thickness by 4 ± 1/4 inches
wide by at least four times its thickness in length.
4.5.10.2 Apparatus. The following apparatus shall be used:
(a) Set of two parallel metal compression plates as shown on Figure 1.
(b) Aging chamber in accordance with ASTM D 573.
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