MIL-DTL-21115L
TABLE IIb. Physical requirements (Type III)
Characteristic
Class 1
Class 2
Class 3
Class 4
Weight, oz./sq.yd.
5.8 (+ 0.5)
4.85 (min)
6.5 (+ 0.5)
6.6 (+ 0.5)
Yarns per inch, (min.)
Warp
54
55
50
50
Filling
42
48
44
44
Breaking strength, lbs., (min.)
Warp
100
70
100
100
Filling
80
65
80
80
Shrinkage percent, (max.)
Warp
2.5
4.0
2.5
2.5
Filling
2.0
3.0
2.0
2.0
Weave
Plain
Plain
Plain
Plain
3.6.1 Width. Unless otherwise specified, the width of the finished cloth for all types and
classes shall be a minimum of 60 inches exclusive of selvage.
3.7 Finish. The cloth shall be scoured, lightly fulled, brushed, sheared, pressed, and decated
so as to provide a finish equal to that of the standard sample.
3.7.1 Creping. The finished cloth shall show no more creping after the shrinkage test than
exhibited by the standard sample. Testing shall be as specified in 4.3.4.
3.7.2 Wrinkle resistance. The Type III finished cloth shall not show wrinkling to a greater
degree than shown by the standard sample after one dry-cleaning. When a standard sample is
not available the cloth shall show a Wrinkle Recovery rating of 4.0. Testing shall be as specified
in 4.3.4.
3.7.3 Pilling. The Type III cloth shall be processed to show no more pilling than the
standard sample. When no standard sample is available the cloth shall show a rating of 4 using
the ASTM Photograph Rating Standard (see 6.4). Testing shall be as specified in 4.3.4.
3.7.4 pH. The pH value of the water extract of the finished cloth shall be not lower than 5.5
or higher than 8.5 when tested as specified in 4.3.4.
3.8 Length and put-up. For Government procurement only, unless otherwise specified (see
6.2), the cloth shall be furnished in continuous lengths, each not less than 50 yards. The cloth
shall be put-up on full-width rolls as specified in 5.1.
3.9 Wool content label. The cloth shall be labeled in accordance with the Wool Products
Labeling Act (see 2.2.2).
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