MIL-PRF-121G
4.6.4 Waterproofness.
4.6.4.1 Preparation of test specimens. Five 6 by 8 inch pouches shall be fabricated from as
received material using the sealing conditions specified in 4.5. Five additional pouches shall be
similarly prepared using barrier material that was aged in accordance with 4.6.3. Each pouch
shall be filled with white filter paper and a final heat-seal closure effected. The bags shall then
be immersed under a one-inch head of water containing Aerosol O.T. and a water-soluble red
dye to aid in determining leakage. The water shall be maintained at 73 ± 5 °F and the length of
immersion shall be not less than 72 hours. At the conclusion of the test, the bag shall be
removed, allowed to drain, opened at one end and the filter paper shall be examined for dye
staining. Staining of the filter paper or delamination of the barrier material shall constitute a
failure.
4.6.5 Low temperature flexibility. Twenty 4 by 12 inch test specimens shall be drawn from
the sample roll of barrier material, ten in each principal direction. Clamps to facilitate
subsequent handling of the specimens shall be placed at both ends of each specimen. The
specimens shall be placed in a test chamber maintained at -25 ± 2 °F for at least one hour.
Placement of the specimens in the chamber shall allow full air circulation against all surfaces of
each specimen. Each specimen shall be individually removed from the chamber and
immediately drawn lengthwise over a 1/4 inch diameter stainless steel mandrel while
maintaining the specimen in a bend of approximately 180 degrees throughout the test. This
flexing operation shall be conducted rapidly and should be completed within 3 seconds after
removal of the specimen from the cold chamber. The test shall be conducted on five specimens
from each principal direction with the heat-sealable face against the mandrel. The remaining ten
specimens shall be similarly tested with the opposite face in contact with the mandrel. Each
specimen shall be observed for evidence of delamination, cracking, or ply separation.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain
requisite packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activity within the Military Department or Defense Agency, or within
the Military Department's System Command. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
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