MIL-DTL-10176K
3.4.1.3 Polyester. The polyester fiber shall be semi-dull polyester fiber made from
polyethylene glycol terephthalate either homopolymer or modified polymer as appropriate. The
minimum average fiber length shall be 3 inches and shall be a suitable denier to blend adequately
with the specified wool grade. The use of polyester fiber waste is prohibited. Testing shall be as
specified in 4.3.4.
3.4.2 Yarn.
3.4.2.1 Wool yarn for Type I cloth. The wool shall be spun from combed top on either the
Bradford, French or American system. The yarn shall be spun into 2-ply and shall contain not
less than 95 percent wool based on the dry weight of the specimen when tested as specified in
4.3.4.
3.4.2.2 Polyester/wool blend yarn for Type II cloth. The polyester fiber and wool fiber shall
be blended and spun into 2-ply for both the warp and filling. The use of wool top produced from
laps, noils, or any other wool manufacturing by-product is prohibited. The finished cloth shall
consist of the following fiber percentages based on dry weight of the specimen when tested as
specified in 4.3.4.
Percentage
Fiber
Minimum
Maximum
Polyester
55
60
Wool
40
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3.5 Color. The color shall be as specified (see 6.2) and shall match the standard sample.
The color for Type I cloth shall be obtained by blending stock or top dyed wools; the color for
Type II cloth shall be obtained by blending top dyed wool with stock, top, or tow dyed polyester
fibers, with the wool and polyester fibers dyed separately and then blended.
3.5.1 Mothproofing. Mothproofing of the wool material, in accordance with MIL-C-43665,
shall be accomplished during stock or top dyeing as applicable.
3.5.2 Visual shade matching (all types and classes). The color and shade of the finished
cloth shall match the standard sample when viewed using AATCC Evaluation Procedure 9,
Option A, under filtered tungsten lamps that approximate artificial daylight D75 illuminant with
a color temperature of 7500 ± 200 K, with illumination of 100 + 20 foot candles and shall be a
good match to the standard sample under horizon lamplight at 2300 ± 200 K.
3.5.3 Colorfastness (all types and classes). The finished cloth shall conform to the
colorfastness requirements in below in Table I when tested as specified in 4.3.4.
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