MIL-DTL-24640/20E
TABLE I. Construction details.
Component
Conductor
Cable diameter
Cable weight
wire diameter
resistance
PIN
Type
AWG
Jacket thickness
(inch)
(pounds per
(inch)
per 1000
M24640/20
number
size
(inch) (min.)
1000 feet)
feet
(max.)
(min.)
(max.)
(min.)
(max.)
(ohms)
-01UN
TXW-3
16
0.075
0.081
0.034
0.246
0.266
65.2
4.35
-02UN
TXW-4
14
0.091
0.097
0.038
0.292
0.314
99.1
2.88
TABLE II. Construction details - overall shield.
Component
Conductor
Cable diameter
Cable weight
wire diameter
resistance
PIN
Type
AWG
Jacket thickness
(inch)
(pounds per
(inch)
per 1000
M24640/20
number
size
(inch) (min.)
1000 feet)
feet
(max.)
(min.)
(max.)
(min.)
(max.)
(ohms)
-01UO
TXOW-3
16
0.075
0.081
0.034
0.305
0.329
113.5
4.35
-02UO
TXOW-4
14
0.091
0.097
0.038
0.343
0.369
147.5
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
2
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