MIL-DTL-16878H
3.6.6 Concentricity. The concentricity of finished wire insulation to the conductor and of the primary
insulation of multi-layered insulation or jacket to the conductor shall be 70 percent minimum.
3.6.7 Surface resistance (wire with outer braid only). The surface resistance shall be
5 megohm-inches minimum. A surface resistance of less than 1,000 megohm-inches shall not change by
more than 50 percent from the initial measured value after the application of the high potential and
re-measurement of surface resistance.
3.6.8 Heat resistance. After subjection to the heat resistance condition specified on the applicable
specification sheet, wire shall exhibit no cracking or delamination of the insulation (and jacket, when
applicable), no exudation of the insulation through the braid in constructions incorporating braid, and no
readily visible defects in any of the wire component parts (slight discoloration after aging is considered
normal and acceptable), and shall withstand the dielectric withstanding voltage specified on the
applicable specification sheet.
3.6.9 Flammability. When subjected to an open flame, insulation shall not burn for more than the
specified time nor release flaming particles, and the flame shall not travel more than the distance
specified in the VW-1 flame test of UL1581.
3.6.10 Shrinkage. When subjected to contact with molten solder, insulation shall not flare away from
the conductor, open up over the bent portion called for in the test, nor shrink back more than .125 inch.
3.6.11 Heat aging. After being aged for 96 hours at the temperature specified on the applicable
specification sheet, insulation elongation and tensile strength shall not change more than the value
specified on the applicable specification sheet.
3.6.12 Insulation tensile strength. The minimum tensile strength of insulation shall be as specified on
the applicable specification sheet.
3.6.13 Insulation elongation. The minimum elongation of insulation shall be as specified on the
applicable specification sheet.
3.6.14 Marking and stripe durability. Unless otherwise specified on the applicable specification
sheet, wire markings and stripes shall remain legible after being repeatedly subjected to abrasion.
3.6.15 Fungus resistance. All non-metallic materials that are not fungus-inert shall be
fungus-resistant.
3.6.16 Partial discharge (corona). When specified on the applicable specification sheet, the
insulated wire shall be capable of withstanding exposure to an applied voltage 20 percent greater than
the minimum partial-discharge extinction level specified in ASTM D2802.
3.7 Identification of product. Unless otherwise specified (see 3.1 and 6.2), finished wire shall be
identified in accordance with the practices set forth under 1.2. A printed marking shall be applied to the
outer surface of the wire or be visible through the outer surface. The printed identification shall be
marked at intervals of 9 to 60 inches measured from the beginning of one complete marking to the
beginning of the succeeding complete marking and shall consist of the following:
a. The first three elements of the PIN (see 1.2.2, 1.2.3, and 1.2.4).
b. Voltage rating.
c. Manufacturer's CAGE code or identifying mark.
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