MIL-DTL-44431B
Table II. Water repellent requirements
Hydrostatic height
Dynamic absorption
(centimeter)
(percent)
(min lot avg) min 2/
(max lot avg) max 3/
Spray rating 1/
Initial
90, 90, 90
25
20
20
30
After 3
launderings
80, 80, 80
20
20
-
-
After 15
launderings
- -
-
-
-
-
-
1/ Three individual determinations shall be equal to or better than the rating specified.
2/ No individual specimen shall fall below the specified minimum.
3/ No individual specimen shall exceed the specified maximum.
3.7.1 Resistance to organic liquid. The finished cloth shall show no wetting by n-tetradecane
either initially or after 15 launderings when tested as specified in 4.4.3.
3.8 pH. The pH of the water extract of the finished cloth shall be not less than 5.0 and not greater
than 8.5 when tested as specified in 4.4.3.
3.9 Dimensional stability. The shrinkage or elongation both in the warp and filling of the
finished cloth shall not be greater than 3.0 percent for the individual sample unit average when
tested as specified in 4.4.3. The preshrinking process shall not be identified by name or
trademark either on the cloth, ticket, or package.
3.10 Seam efficiency. The finished cloth shall have a seam efficiency of not less than 60 percent
minimum when tested as specified in 4.4.3.
3.11 Length and put-up. For Government procurements only, unless otherwise specified (see
6.2), the cloth shall be furnished in continuous lengths, each not less than 40 yards. Each length
shall be put up on a roll as specified in 5.1.
3.12 Face identification. The face side of the cloth shall be identified by stamping the word
"FACE" on that side at each end of the roll.
3.13 Fiber identification. Each roll of the cloth shall be labeled or ticketed for fiber content in
accordance with the rules and regulations under the Textile Fiber Products Identification Act.
3.14 Workmanship. The finished cloth shall conform to the quality of product established by this
specification. The demerit points per 100 square yards when calculated as specified in section 4
shall not exceed the established maximum point value.
3.15 Toxicity. The finished cloth shall not present a health hazard when used as intended. (see
4.4.3.1).
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