MIL-DTL-29597C(NAVY)
3.3 Form. The barrier material shall be converted into and furnished as bags. Nominal bag
sizes and minimum inside width dimensions shall be as specified in table III. Heat-seals shall be
0.25 ± 0.05 inch (0.64 ± 0.13 centimeter).
TABLE III. Bag sizes
MINIMUM INSIDE
NOMINAL LENGTH
NOMINAL
SIZE
WIDTH (INCHES)
(INCHES)
WIDTH (INCHES)
A
50
36
34.5
B
27
24
22.5
C
34
31
29.5
D
40
16.75
15.75
(Type II only)
3.3.1 Type I, class1. Type I, class 1 bags shall have either two heat sealed sides with the
bottom folded and creased, or 3 heat sealed sides. One side of the bag opening shall extend
2.25 to 2.75 inches (5.7 to 7.0 centimeters) higher than the other side of the bag opening creating
a flap. A 4-inch-wide pressure sensitive adhesive (PSA) strip shall be placed across the entire
width of the bag opening so that two inches of the PSA adheres to the lower edge of the bag
opening and two inches adheres to the flap (see figure 1). The PSA shall be covered with two
easily removable release liners that shall not interfere with the initial opening of the bag. The
bag shall be sealed by removing both release liners and folding the flap over the lower edge
effecting adhesive to adhesive contact along the entire width of the bag.
Flap
PSA areas
Heat seal
Lower edge of
bag opening
FIGURE 1. Class 1 bag construction.
3.3.2 Type I, class 2. Type I, class 2 bags shall be formed with one heat seal from rolls of
flat lay tubing, two heat seals with the bottom folded and creased, or three heat seals. Bags shall
be supplied on rolls (see 3.3.4). Perforations shall be created to enable bags to be removed from
the roll by hand. The perforations shall occur below the heat-seal, and shall be less than 0.25
inch (0.64 centimeter) below the effected heat-seal. Perforations shall not interfere with the
integrity of the seal (see 4.3.2).
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