MIL-DTL-49055F
3.3 Materials. The materials for the principal components of the cable shall be as specified herein.
Prior approval to use substitute material must be obtained from the qualifying activity. When a definite
material is not specified, a material shall be used that will enable the finished products to meet the
performance requirements of this specification. Acceptance or approval of any constituent material shall
not be construed as a guaranty of the acceptance of the finished product. All materials used in the
manufacture of cables furnished hereunder shall be of such quality and form that the finished product
conforms to the requirements of this specification. All materials used shall conform to the requirements
specified herein.
3.3.1 Insulation material. Insulation materials are listed in table I. These materials shall have
temperature ratings and aging temperatures as specified herein.
3.3.2 Conductors. Conductors shall be stranded, bare or coated, as specified (see 3.1). All
conductors shall conform to ASTM-B286 requirements.
3.3.2.1 Conductor strands.
a. Bare copper conductor. Bare copper conductors shall conform to soft or annealed copper
conductor in accordance with ASTM-B3.
b. Tin-coated copper conductor. Tin-coated copper conductor shall conform to the continuity and
adherence coating requirements for tinned, soft or annealed copper conductor in accordance with
c. Silver-coated copper conductor. Silver-coated copper conductor shall have a thickness of not less
than 40 microinches of silver and meet the continuity of coating requirements of ASTM-B298.
d. Nickel-coated copper conductor. Nickel-coated copper conductor shall have a thickness of not
less than 50 microinches of nickel and meet the continuity of coating requirements of ASTM-B355.
TABLE I. Insulation materials, ratings, and aging temperatures.
Temperature rating
1/
Material
Aging temperature
1/
(max)
2/
Polyvinylchloride (PVC)
105°C
136°C
Polyethyleneterephthalate (PET)
105°C
136°C
Polyvinylidene fluoride (PVDF)
135°C
150°C
Polyalkene, crosslinked
150°C
225°C
Ethylene tetrafluoroethylene (ETFE)
150°C
200°C
Ethylene tetrafluoroethylene
150°C
200°C
modified, crosslinked
Ethylene-chlorotrifluoroethylene (ECTFE)
150°C
200°C
Fluorinated ethylene propylene (FEP)
200°C
230°C
FEP-polyimide tape
200°C
230°C
Polytetrafluoroethylene (PTFE)
260°C
300°C
Perfluoroalkoxy (PFA)
260°C
285°C
1/ For information only.
2/ Not for aerospace application.
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