MIL-DTL-24640/2E
Physical properties of primary insulation
2500 lb/in2 (min.)
Tensile strength
Elongation
150 percent (min.)
Shrinkage
Non-blocked
0.125 inch (max.) at 300±2 °C (572±3.6 °F)
Water-blocked
0.125 inch (max.) at 250±2 °C (482±3.6 °F)
Surface resistance
500 megohms inches (min.), initial and final readings
Thermal shock
Oven temperature, 150±2 °C (302±3.6 °F)
Maximum change in measurement
0.060 inch
Wet dielectric test
2500 volts (root mean square)
Wrap test
Mandrel wrap test required
INSPECTION:
Basic Electricals:
Conductor resistance (ohms/1000 feet at 25 °C, max.)
See table I
Voltage withstand (volts, root mean square, min.)
Conductor to conductor.
2000
Conductor to shield
Not applicable
Shield to shield
Not applicable
Insulation resistance (megohms/1000 feet, min.)
2500
Conductor continuity
No failure
Jacket flaws
No failure
Group A:
Visual and dimensional
No failure
Capacitance:
Mutual capacitance (at 1 MHz, picofarads/foot (pF/ft), max.)
Not applicable
Capacitance unbalance (percent, max.)
Not applicable
Characteristic impedance (at 1 MHz, ohms)
Not applicable
Watertightness (Type TXWB only)
No failure
(see table IX of MIL-DTL-24640 for limits of leakage)
Weight
No failure
Group B:
Cold bending
No failure
Cross-link proof test (percent, max.)
3
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