MIL-PRF-131K
from the top of the top grip as from the bottom of the bottom grip. Test speed shall be 20 inches
per minute. Specimens shall be tested in accordance with ASTM-D882, obtaining an average
result for each direction. Breaking strength shall be the lowest average result of the two
directions. Breaking strength shall also be determined with aged material which has been
exposed to an atmosphere of 80 to 85 percent relative humidity and 160 ± 2 °F for 72
consecutive hours. Aging shall be accomplished on a large sheet of material with individual test
specimens cut from the aged sheet. Again, breaking strength shall be the lowest average result of
the two directions.
4.6.6 Tear strength (class 3 only). Five specimens 3 by 6 inches shall be cut with the short
dimension parallel to the machine direction and another five specimens of the same size cut in
the transverse direction. Each set of specimens shall be tested as-received for maximum tearing
load in accordance with ASTM-D5733, obtaining an average result for each direction. Clamps
shall be rubber-faced pneumatic grips and shall be 3 inches in width (perpendicular to the
application of force) and at least 1 inch in height. Initial grip separation shall be 1 ± 0.05 inches.
Test speed shall be 12 ± ½ inches per minute. Tear strength shall be the lowest average result.
4.6.7 Backing peel strength (class 3 only). Five specimens 1 by 6 inches shall be cut with
the long dimension parallel to backing warp and another five specimens of the same size cut with
the long dimension parallel to the backing fill. Each specimen shall be prepared by peeling the
woven backing approximately 2 inches from one end. A T-peel test shall be effected using
rubber-faced pneumatic grips with the gripping surfaces 1 by 1 inch. Initial grip separation shall
be 1 inch. Test speed shall be 12 ± ½ inches per minute. Peel distance shall be the distance the
movable grip travels after the first significant load is recorded. Peel strength shall be determined
by measuring the mean load over a peel distance of 1 to 5 inches and dividing by the width of the
specimen.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system commands. 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.
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