MIL-DTL-22931D
3.2.2.2 Polystyrene. Polystyrene tapes shall be made from biaxially oriented sheets of pure
polystyrene, free from colorants or lubricants. In addition, the polystyrene shall have a minimum heat
distortion temperature of 92ºC, measured in accordance with ASTM D648; a dielectric constant of 2.5 at 1
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x 10 hertz (Hz); and a dissipation factor of 0.0003 maximum at 1 x 10 Hz, both measured in accordance
with ASTM D150.
3.2.2.3 TFE fluorocarbon. TFE fluorocarbon shall be polytetrafluoroethylene. The dielectric constant
and dissipation factor (tangent of loss angle) shall not exceed 2.1 and 0.0003, respectively, when
measured in accordance with ASTM D150.
3.2.2.4 Polypropylene. Polypropylene shall be acceptable, provided the manufacturer certifies the loss
factor does not exceed 0.0012.
3.2.3 Outer conductors. The outer conductor (or shield) of the cable shall be braided, smooth, or
corrugated metal tube, as specified (see 3.1), and shall be in accordance with 3.2.3.1 to 3.2.3.2.2. The
conductor may be formed in any manner, provided the requirements of this specification are met.
3.2.3.1 Braid. The individual strands of the braid shall conform to A-A-59551.
3.2.3.2 Tubes and strips.
3.2.3.2.1 Aluminum. Aluminum tubes shall conform to the requirements of ASTM B210, ASTM B234
or ASTM B221, as applicable. Aluminum strips may be used to form tubes provided they meet the
requirements of ASTM B209.
3.2.3.2.2 Copper. Copper tubes shall conform to the requirements of ASTM B188. Copper strips shall
conform to the requirements of ASTM B152/B152M.
3.2.4 Jacket (when applicable). The jacket shall consist of a continuous sheet of polyethylene
conforming to type I or II, class C of ASTM D1248.
3.2.4.1 Thickness. The minimum wall thickness of the jacket at any point shall be as specified
(see 3.1).
3.3 Dimensions. The dimensions of the cables shall be as specified (see 3.1).
3.4 Electrical performance.
3.4.1 Continuity. When cables are tested as specified in 4.5.2, each conductor in each reel of cable
shall be continuous.
3.4.2 Voltage withstand. When cables are tested as specified in 4.5.3, the completed cable shall
withstand the potential specified (see 3.1) without breakdown.
3.4.3 Insulation defects, spark (when applicable, see 3.1). When cables with jackets are tested as
specified in 4.5.4, the jacket shall be continuous without cracks, breaks or holes.
3.4.4 Insulation resistance. When cables are tested as specified in 4.5.5, the insulation resistance per
1,000 feet shall be not less than 100,000 megohms.
3.4.5 Attenuation. When cables are tested as specified in 4.5.6, the attenuation shall be as specified
(see 3.1).
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