MIL-DTL-81188C
3.3.2 Basic material
3.3.3 Cloth. The cloth shall be a simplex jersey knitted with a meta-aramid yarn. The simplex jersey shall be
knitted on a 24-gauge machine. The cloth shall weigh 9-10 ounces per square yard when tested according
to Table II: 36 wales by 28 courses per inch minimum and 20-35 percent stretch length and 60-80 percent
stretch width when tested according to Table II. The yarn blend shall consist of 92% meta-aramid fiber, 5%
para-aramid, and 3% conductive fiber. The aramid fibers shall have a nominal denier of 1.5-1.7 denier per
filament, staple length of 1.5-2.0 inches and shall not char at a temperature less than 675oF when tested
according to Table II. The maximum flame time and char length of the cloth in the wale direction shall be 2.0
seconds and 4 inches respectively when tested according to Table II. The finished cloth when charged
toward +5000 volts and -5000 volts and reaches a minimum level of +2500 volts and -2500 volts shall
dissipate at 90 percent of this charge in less than or equal to 1/2 second. The average wale and course
results shall meet these requirements before and after 5 launderings when tested according to Table II.
The color shall be obtained using solution dyed fibers and shall be as specified in the contract or order. The
color of the test specimen shall match the standard sample when viewed under filtered tungsten lamps that
approximate artificial daylight, and that have a correlated color temperature of 7500K (+) 200K, with
illumination of 100 (+) 20 foot candles, and shall be a good match to the standard sample under
incandescent lamplight at 2300K (+) 200K. The dyed cloth shall show colorfastness to light and laundering
equal to or better than the standard sample when tested according to Table II. The pH value of the water
extract of the finished cloth shall be 5.0-8.0 when tested according to Table II.
Certificates of compliance shall be submitted for all requirements and the Government reserves the right to
inspect such items to determine the validity of the certification.
3.3.4. Elastic webbing. The elastic webbing shall have a width of 5/16 inches (+ 1/32) or 7/16 inches (+
1/32) (see Table II) (unbleached, bleached or dyed) having a elastomeric core. The elastomer shall be
constructed (woven, braided or knit) with an appropriate yarn and have a minimum weight of 0.16 oz/lin. yd.
and have a minimum of 68 yarns per inch.
The initial tension at 50% elongation when using a 10-pound weight shall be a minimum of 0.80 and a
maximum of 1.10 (Table II). The tension after accelerated aging (Table II) shall not change more then 20%.
3.3.5. Thread. The thread shall be continuous, multifilament, aramid yarn. The thread shall have a Tex of 40.
The thread shall have a breaking strength of 3-pound minimum and elongation of 38 percent maximum using
five determinations per sample when tested as noted in accordance with Table II. The thread shall maintain
85% breaking strength after heat aging. For the heat aging 5 samples shall be exposed at a temperature of
500+100 degrees F. for 5 hours (see Table II). The thread shall be dyed to approximate the color of the
base cloth. Color fastness shall be consistent with the end item. The thread may have a soft finish of a
nonstaining, non-flame propagating nature to facilitate sewing. No finish shall be applied for the purpose of
increasing break strength.
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