MIL-DTL-915/81A
Fifth
- Cable jacket of black polyethylene copolymer, applied so as to completely fill
the pair valleys. Unless otherwise specified in the contract or order, the cable
jacket material shall be Union Carbide Corp. #DFDA-0588, black #9865 or
equal. Cable jacket shall be capable of being removed without incurring
damage to the insulation jacket or the insulation. Nominal wall thickness
0.060 inch. Minimum wall thickness at any cross section 0.054 inch. Cable
overall diameter shall be 0.285 + .005 inch.
EXAMINATION AND TESTS:
Requirements
Basic electrical:
Conductor resistance - ohms/1000 feet, at 20°C, maximum..................................11.1
Voltage withstand - volts, root mean square, minimum
Conductor to conductor.... ......................................................................... 2000
Conductor to water.....................................................................................2000
Insulation resistance - megohms/1000 feet, minimum..........................................5000
Insulation dielectric. Test 100 percent of insulated conductors before application
of insulation jacket. Test in accordance with MIL-W-81381, using a test voltage of
8.0 kV (peak), minimum.
Group A:
Visual and dimensional ................................................................................. No failure
Conductor (before application of insulation)
Silver coating - thickness in micro inches, minimum.
(Test in accordance with ASTM B 298) ....................................................... 40
Tensile strength - pounds, minimum ............................................. 55.6
Elongation - percent, minimum ....................................................... 6.0
(Test tensile strength and elongation in accordance with FED-STD-
228, method 3212, except as follows. Test not less than 3
specimens per each 1000 feet of conductor. Specimen length shall
not be less than 20 inches. Tensile strength shall be in pounds.
Specimen zero length shall be as near to 10 inches as practical.)
Group B:
Cold bending, cable - at minus 40°C, 3-inch diameter, mandrel. .............. No damage
Physicals (unaged)
Insulation
Tensile strength - lbf/in2, minimum .............................................. 5000
Elongation - percent, minimum ...................................................... 150
Insulation jacket
Tensile strength - lbf/in2, minimum .............................................. 1400
Elongation - percent, minimum ...................................................... 300
2
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