MIL-DTL-55668D
TABLE III. Cord requirements.
Test paragraph
Property
Value
Cord retractility
Contiguous
Breaking load, minimum pounds
70
2-conductor cords only
60
Cord extension (7:1) force, maximum ounces
32
Retraction after static vertical loading, percent of original length:
Stranded wire cord, maximum percent
120
Tinsel wire cord, maximum percent
110
Stretch cycling (6:1) extension):
Variation in resistance during cycling, maximum percent
5
Increase in resistance during or after cycling, maximum percent
10
Retraction after cycling, maximum percent of original length
120
°
Bending flex (180 ):
Stranded wire cord, minimum number of cycles
5,000
Tinsel wire cord, minimum number of cycles
15,000
Low temperature (-55 C) extension and retraction:
Cord extension (4:1) force, maximum ounces
35
Retraction, percent of original length:
Stranded wire cord, maximum percent
160
Tinsel wire cord, maximum percent
125
Cold bend (-55 C)
No cracks
Low temperature ( -55 C) rapid extension
No cracks
Retraction at 85 C, maximum percent of original length
275
Voltage withstand, as received, test volts
1,000 without breakdown
Insulation resistance, as received minimum megohms
1,000
Continuity
No opens
Humidity cycling
Voltage withstand, test volts
1,000 without breakdown
Insulation resistance per finished cord length, minimum
megohms
1,000
Continuity
No opens
Simulated storage, 336 ±2 hrs & 85 ±1 C
Voltage withstand, test volts
1,000 without breakdown
Insulation resistance, per finished cord length, minimum
megohms
1,000
Low temperature (-55 C) rapid extension
No cracks
3.9 Workmanship. The cords shall be a uniform and consistent product and shall be free from any
defects which will adversely affect the serviceability of the product, such as lumps, kinks, splits,
abrasions, scrapes, corroded surfaces, skin impurities and faulty extruded surfaces.
3.10 Recycled, recovered, or environmentally referable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
8
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