MIL-DTL-3738L
3.3 Material.
3.3.1 Stock. The wool shall be fleece wool, pulled wool, or any combination thereof not lower
in grade than the U.S. Standard grades specified below. The use of laps, noils, or any other wool
manufacturing by-products shall be prohibited.
Type I
-
70's U.S. Standard
Type II
Class I
-
64's U.S. Standard
Class 2
-
70's U.S. Standard
Type III
-
70's U.S. Standard
Type IV
-
70's U.S. Standard
3.3.2 Yarn. The wool shall be spun from combed top on either the Bradford, French, or
American system. The yarn for both warp and filling shall be 2 ply. (NOTE: Selvage yarn. To
prevent edges of all types of cloth from building up when rolled, two ply yarns used in the
selvage may be made of a finer count than those used in the body of the cloth).
3.4 Color. The color of the finished cloth for Types I, II, and III shall be as specified (see 6.2
and 6.4). The color shall be obtained by stock or top dyeing. Piece dyeing will not be permitted.
The color for Type IV shall be Cadet Gray 172.
3.4.1 Mothproofing. In the dyeing operation, the stock or top shall be mothproofed in
accordance with MIL-C-43665.
3.4.2 Matching. The color and appearance of the dyed and finished cloth shall match the
standard sample when viewed under filtered tungsten lamps which approximate artificial
daylight having a correlated color temperature of 7500 + 200 Kelvin (K), with illumination of
100 + 20 foot candles, and shall be a good match to the sample under incandescent lamplight at
2300 + 200 K.
3.4.3 Colorfastness. The finished cloth shall show fastness to perspiration, wet-drycleaning
and light and shall have an AATCC Chromatic Transference Scale rating of 3.0 when tested as
specified in 4.3.4. The finished cloth shall show fastness to crocking and shall have an AATCC
Chromatic Transference Scale rating of 3.5 when tested as specified in 4.3.4.
3.5 Physical requirements. The finished cloth shall conform to the requirements specified in
Table I and when tested as specified in 4.3.4.
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