MIL-PRF-121G
4.6.2.3.3 Test at 100 °F. The six 1-inch-wide specimens selected for this test (see 4.6.2.3.1)
shall be tested as specified in 4.6.2.2.3.
4.6.2.3.4 Test at 160 °F. The six 1-inch-wide specimens selected for this test (see 4.6.2.3.1)
shall be tested as specified in 4.6.2.2.4.
4.6.2.4 Seam strength sealed after aging.
4.6.2.4.1 Test specimens. The six sections for this test (see figure 1), in the flat unsealed
condition as taken from the sample roll, shall be aged in a circulating air oven maintained at
160 ± 2 °F for 12 consecutive days (288 hours). After removal from the oven the unsealed
sections shall be returned to room temperature. Test specimens shall then be obtained as
specified in 4.6.2.2.1.
4.6.2.4.2 Test at room temperature. The six 1-inch-wide specimens selected for this test
(see 4.6.2.4.1) shall be tested as specified in 4.6.2.2.2.
4.6.2.4.3 Test at 100 °F. The six 1-inch-wide specimens selected for this test (see 4.6.2.4.1)
shall be tested as specified in 4.6.2.2.3.
4.6.2.4.4 Test at 160 °F. The six 1-inch-wide specimens selected for this test (see 4.6.2.4.1)
shall be tested as specified in 4.6.2.2.4.
4.6.3 Aging resistance. Three specimens, 36 by 6 inches, cut from across the roll of
material, at points which shall be not less than 1 yard apart, shall be used for this test.
4.6.3.1 Procedure. The specimens shall be subjected to the following aging cycle:
8 hours in a humidity chamber at 100 ± 2 °F and 90 to 95 percent RH, followed by
16 hours in a circulating air oven at 160 ± 2 °F.
The aging cycle shall be repeated every weekday for five consecutive days. The specimens shall
remain in the circulating air oven at 160 ± 2 °F on Saturday, Sunday, and holidays, except that
holidays shall not exceed a total of two days over the entire aging period. The aging procedure
shall continue for fourteen consecutive days. The specimens shall be folded loosely, hung, rolled
loosely, or laid flat in the test chamber during the aging period. At the conclusion of the aging
period the specimens shall be returned to room temperature and examined, particularly at all
edges, for delamination brought about by the aging exposure. There shall be no prying or
picking of the plies when examining the amount of ply separation. For purposes of this test,
delamination shall occur if ply separation at any one given point extends in more than 1/2 inch
from the edge with an edge length separation greater than 1-inch. Satisfactory specimens shall
be returned for use in conducting the "aged" portion of waterproofness and oil resistance testing.
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