MIL-DTL-24640/21E
TABLE I. Construction details.
Component
Cable
Cable weight
Conductor
Jacket
wire diameter
diameter
PIN
Type
AWG
(pounds per
resistance
thickness
(inch)
(inch)
M24640/21
number
size
1000 feet)
per 1000
(inch) (min.)
(max.)
feet (ohms)
(min.)
(max.)
(min.)
(max.)
-01UN
FXW-3
16
0.075
0.081
0.034
0.266
0.286
78.2
4.35
-02UN
FXW-4
14
0.091
0.097
0.038
0.315
0.339
115.1
2.88
TABLE II. Construction details - overall shield.
Component
Cable
Cable weight
Conductor
Jacket
wire diameter
diameter
PIN
Type
AWG
(pounds per
resistance
thickness
(inch)
(inch)
M24640/21
number
size
1000 feet)
per 1000
(inch) (min.)
(max.)
feet (ohms)
(min.)
(max.)
(min.)
(max.)
-01UO
FXOW-3
16
0.075
0.081
0.038
0.324
0.350
131.6
4.35
-02UO
FXOW-4
14
0.091
0.097
0.041
0.366
0.394
164.9
2.88
REQUIREMENTS:
Qualification required.
Component wire: For polyimide tape constructions, the following additional tests shall be applicable in
accordance with MIL-DTL-81381.
Temperature rating
150 °C (302 °F) (max.) conductor temperature
Voltage rating
600 volts (root mean square) at sea level
Blocking
Oven temperature, 150±2 °C (302±3.6 °F) no sticking of
conductors
Flammability
3 seconds (max.) after flame
3.0 inches (max.) flame travel
No flaming of tissue paper
Humidity resistance
5 megohms for 1000 feet (min.) insulation resistance after
humidity exposure
Impulse dielectric test
8.0 kV, 100 percent impulse test
Insulation resistance
2500 megohms for 1000 feet (min.)
Polyimide cure test
No cracking
Shrinkage
0.062 inch (max.) at 180 °C
Surface resistance
5 megohms inches (min.), initial and final readings
Thermal shock
Oven temperature, 150±2 °C (302±3.6 °F)
Maximum change in measurement
0.031 inch
2
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