MIL-DTL-44436B
TABLE VII. Physical requirements. - Continued
Class
Class
Class
Characteristic
1, 3, 5 6 & 9
2, 7, &10
8
Air permeability,
15.0
10.0
10.0
(cu.ft./min/sq.ft.), (maximum)
Fabric appearance, (smoothness
rating)
5
Initial
N/A
N/A
4.5
After 20 launderings
N/A
N/A
3.8.1 Weave. The weave shall be a plain weave with reinforcement ribs in both the warp and
filling directions forming a uniform pattern. The ribs shall be formed by having every twenty-
forth warp end contain two ends weaving as one and every thirteenth filling contain two picks
weaving as one. Testing shall be as specified in 4.4.4.
3.8.2 Width. For Government procurements only, the width of the cloth shall be as specified
(see 6.2) and shall be the minimum acceptable width inclusive of the selvage when fly-shuttle
looms or shuttleless with tuck-in selvage are used. For all other shuttleless looms, the width
measurement shall be made between the last warp yarn on each side excluding the protruding
fringe(s).
3.9 Finish. The cloth shall be dyed and printed with the warp effect side as the face. The
cloth shall be, desized, scoured, dyed, and printed. The Class 2, 7, and 10 cloth(s) shall be given
a water repellent treatment as specified in 3.9.1. The Class 8 cloth shall be given a wrinkle free
finish as specified in 3.9.2.
3.9.1 Water repellency (Class 2, 7 and 10). The Class 2 ,7 and 10 cloth(s) shall be given a
fluorocarbon (Quarpel Type) water repellent treatment and meet the requirements of Table VIII
when tested as specified in 4.4.4.
TABLE VIII. Water repellency (Class 2, 7 and 10)
Dynamic absorption (percent)
Max. lot avg.
Max. 1/ Spray rating 2/
Initial
25
30
90, 90, 80
After 15 launderings
25
30
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1/ No individual specimen shall exceed the specified maximum.
2/ The results of the three individual determinations on the sample unit for spray rating shall
be equal to or better than the specified ratings when tested as specified in 4.4.4.
3.9.2 Wrinkle free finish (Class 8). The Class 8 cloth shall be given a wrinkle free finish
treatment to match the "hand" crispness, fabric appearance and smoothness of the guide sample
provided.
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