MIL-DTL-13169E
or type P (polyamide) thread, conforming to MIL-C-572. The separator may be omitted if a free stripping
insulation is used.
3.1.4 Insulation compound. The insulation compound shall be Buna-S made with such fillers,
antioxidants, organic accelerators, and curing agents as are necessary to provide a compound having
long life in service and in storage. The compound used shall contain no more than .5 percent of free
sulfur. The material shall be homogeneous, tough, and elastic, and shall be properly vulcanized (cured).
The insulation shall be free of blisters, wrinkles, cracks, or other defects that could affect the end use of
the finished wire.
3.1.4.1 Sun-proofing wax. For each 100 pounds of Buna-S polymer, a minimum of 4 pounds of
sun-proofing wax shall be used.
3.1.4.2 Color. The color of the insulation shall be black, red, or green (see 6.2), and the color shade
shall fall within the light and dark limits conforming to MIL-STD-104.
3.2 Construction.
3.2.1 Conductor. The conductor shall be AWG size 18, type B, class 0 (for severe flexing service)
wire conforming to A-A-59551.
3.2.2 Insulation thickness. The insulation over the conductor shall be centered and shall have a
thickness of not less than 40 mils.
3.2.3 Outside diameter. The outside diameter of the finished wire shall not exceed 150 mils.
3.3 Physical properties of insulation. The vulcanized Buna-S insulation shall conform to the physical
property requirements listed in table I.
TABLE I. Physical property requirements of Buna-S insulation.
Physical property
Requirement
Unaged:
Tensile strength, minimum, psi
1,000
1/
8
Elongation, minimum, inches
1/
.5
Set, maximum, inch
After 94 hours in an oxygen-bomb at 70 °C:
Tensile strength, minimum, percent of original
75
1/
6
Elongation, minimum, inches
Cold-tension recovery, minimum, percent
20
1/ See applicable test method for specimen length.
3.3.1 Cold bend. The wire shall show no evidence of cracking of the outer surface of the insulation
after being exposed to a temperature of -40 °C for 7 days and then bent around a .188-inch (4.78 mm)
diameter mandrel.
3.4 Performance.
3.4.1 Insulation flaws. The finished wire shall withstand a spark-test potential of 8,000 V rms at
60Hz, without breakdown.
3.4.2 Dielectric strength. The finished wire shall withstand 4,000 V rms without breakdown.
3.4.3 Insulation resistance. The insulation resistance of the finished wire shall be not less than 1,000
megohms per 1,000 feet.
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