MIL-PRF-87260B(USAF)
3.6 Physical properties and characteristics.
The physical properties and characteristics of the conductive material at the time of
manufacture shall be suitable for the purpose intended and in accordance with TABLE I and the
applicable paragraphs of section 3.
3.7 Performance requirements.
The conductive material shall meet the following performance requirements (in addition to
TABLE I):
3.7.1 Fuel immersion.
The following fuel immersion requirements shall be met:
a. JP-8 immersion at 160°F. The material shall not undergo more than 40.0 percent loss
in "dry-to-dry" and "wet-to-wet" tension properties after 4, 8, and 12 weeks exposure. In
addition, the dry electrical resistivity property of the material after fluid exposure shall not rise
above 5.0 x 1012 ohm-centimeter (ohm-cm) after exposures of 4, 8, and 12 weeks.
b. Wet property assessment at 75°F. The material shall not undergo more than 60.0
percent loss in tension, compression load deflection, and tear resistance properties from dry-to-
wet after a 4-week exposure to JP-8 fuel.
3.7.2 Hydrolytic stability.
The conductive material shall meet the following hydrolytic stability requirements:
a. Humidity exposure at 200°F/95 percent relative humidity. The material shall not
undergo more than 65 percent loss in tensile strength after 6 weeks exposure. The electrical
resistivity property of the material after exposure for 6 and 10 weeks shall not exceed 5.0 x 1012
ohm-cm.
b. Water immersion at 160°F. The material shall not undergo more than 40.0 percent
loss in tensile strength after 12 weeks exposure.
c. Dry bay-dry heat tests at 250°F. The material shall not undergo more than 65 percent
loss in tensile strength after 4 weeks exposure. The electrical resistivity property of the material
shall also be reported on a minimum weekly basis for the duration of exposure and shall not
exceed 5.0 x 1012 ohm-cm after 4 weeks exposure.
3.7.3 Explosion suppression and flame arrestor characteristics.
The conductive materials shall meet the following minimum requirements:
a. Coarse pore material. The coarse pore material shall suppress the combustion
overpressure for a single void ignition of 20.0 volume percent to a value equal to or below 15.0
psid (pounds per square inch differential).
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