MIL-DTL-27500H
3.7.5.1.13 Extruded perfluoroalkoxy. Jackets of extruded perfluoroalkoxy shall have a wall thickness as shown in table V. The
tensile strength and elongation of the jacket shall be 3000 lbf/in2 minimum and 150 percent minimum, respectively, and shall be
tested in accordance with 4.3.13.1.
3.7.5.1.14 Extruded, crosslinked, modified, ethylene-tetrafluoroethylene. Jackets of extruded, crosslinked, modified, ethylene-
tetrafluoroethylene shall have a wall thickness as shown in table V. The color shall be white. The tensile strength and elongation of
the jacket shall be 5000 lbf/in2 minimum and 50 percent minimum, respectively, and shall be tested in accordance with 4.3.13.1.
The XLETFE material shall be formulated in such a manner to achieve a minimum 62% contrast level when marked by a UV laser
source in accordance with 3.8.13.
3.7.5.1.15 Taped Polyimide/Polytetrafluoroethylene. The jackets of Polyimide/Polytetrafluoroethylene shall consist of two tapes.
For constructions requiring an 0.006 to 0.010 inch jacket thickness, the inner tape shall be a fluoropolymer/polyimide/fluoropolymer
coated tape (1 mil minimum thickness) applied with a minimum 50 percent overlap. The outer tape shall be an unsintered
polytetrafluoroethylene (PTFE) tape (2 mil thickness) applied in the opposite direction to the first tape and with a minimum of 50
percent overlap. For constructions requiring an 0.008 to 0.012 inch jacket thickness, the 2 mil outer PTFE tape shall have a
minimum overlap of 67%. The tapes shall be heat sealed after wrapping. The PTFE tape material shall be formulated in such a
manner to achieve a minimum 62% contrast level when marked by a UV laser source in accordance with 3.8.13.
3.7.6 Concentricity of extruded jackets. The concentricity of extruded jackets shall not be less than 70 percent when tested in
accordance with 4.3.16.
3.8 Functional Characteristics.
3.8.1 Dielectric withstand.
3.8.1.1 Dielectric withstand - Component wire. One hundred percent of all finished cable shall be tested in accordance with
4.3.3.1. During this test, there shall be no evidence of electrical breakdown or arcing.
3.8.1.2 Dielectric withstand - Inner jacket. One hundred percent of all finished cable with inner jackets shall be tested in
accordance with 4.3.3.2 During this test, there shall be no evidence of electrical breakdown or arcing.
3.8.1.3 Impulse dielectric (for unshielded/unjacketed configuration). One hundred percent of all finished unshielded and
unjacketed, multi-conductor cable (except MIL-W-8777 and MIL-W-25038), 2-7 conductors, sizes 14-26 AWG and 2-5 conductors,
size 12 AWG, shall pass the impulse dielectric test in accordance with 4.3.3.3. There shall be no evidence of dielectric failure.
3.8.2 Jacket flaws (shielded and jacketed cables only). One hundred percent of all finished cable shall be tested in accordance
with 4.3.4 All flaws shall be removed or marked consistent with the requirements for packaging (see 5.1).
3.8.3 Conductor continuity. All conductors in all lengths of finished cable shall withstand the conductor continuity test of 4.3.8
without indication of discontinuity.
3.8.4 Cold bend (jacketed and shielded-and-jacketed cables only). All finished jacketed and shielded-and-jacketed types of cable
shall withstand the cold bend test of 4.3.6 without evidence of cracking of jackets. Shielded and jacketed cable with jacket material
listed in 4.3.6 shall then pass the voltage withstand test of 4.3.7 without electrical breakdown.
3.8.5 Thermal shock. All finished cable with jacket materials listed in table VI shall withstand the thermal shock test of 4.3.9
without cracking of the jacket.
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