MIL-PRF-22191F
period of 15 minutes at room temperature, the pouches shall be examined for dye leakage at all
seams and especially at the double seam junctions (the points where the vertical seams intersect
the bottom seam at points other than at the corners of the pouch).
4.6.3 Aging resistance (multi-ply materials only). 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 of 100 + 2 °F and 90 to 95 percent relative humidity.
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 maintained at the conditions described above 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. No supplemental attempt to delaminate the material, such as prying or picking at the
plies, shall be carried out. For purposes of this test, delamination shall occur if ply separation at
any one given point extending in more than 1/2 inch from the edge with an edge length
separation greater than 1 inch.
4.6.4 Waterproofness (type II and type III). Prepare test specimens as specified in MIL-
STD-3010, method 2017, except that only unaged samples shall be tested. Prior to flexing, test
specimens shall be conditioned for at least 30 minutes at -20 + 2 °F and the flexing operation
shall be conducted at -20 + 2 °F.
4.6.4.1 Procedure. After flexing the specimen, the sleeve shall be removed and allowed to
come to room temperature and dried by wiping with absorbent material or by placing in a
circulating air oven maintained at 160 °F for ten minutes. The sleeve shall then be made into a
pouch by sealing one of the open ends. The pouch shall be filled with shredded absorbent paper
and shall be placed in a water solution containing 1 percent aerosol OT and methyl violet for ten
minutes. The pouch shall then be removed, wiped dry, and the shredded absorbent paper
examined for dye stain.
4.6.5 Marking abrasion resistance.
4.6.5.1 Preparation of test specimens. Strips 3 inches wide containing marking shall be cut
so that the amount of marking shall be at maximum. The length shall allow that after a bifold
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