MIL-PRF-87260B(USAF)
b. Fine pore material. The fine pore material shall suppress the combustion
overpressure for a single void ignition of 35.0 percent volume to a value equal to or below 15.0
psid. In addition, the fine pore material shall prevent flame propagation for the following
conditions:
(1) At 0.0 psig (pounds per square inch gage) initial pressure and a combustion
volume of 16.7 percent volume, the required material thickness shall be 3.0 inches or less.
(2) At 3.0 psig initial pressure and a combustion volume of 16.7 percent volume, the
required material thickness shall be 5.0 inches or less.
3.7.4 Corrosion and adhesion.
The conductive material shall neither adhere to nor cause any pitting, erosion, or corrosion to
aluminum alloy plates when in contact for 14 days.
3.7.5 Electrical resistivity permanence.
The conductive material's electrical resistivity property shall not rise above 5.0 x 1012 ohm-cm
after exposure to the following conditions:
a.
Water immersion at 120 ± 5°F for 4 weeks
b.
Water immersion at 160 ± 5°F for 3 weeks may be substituted
3.7.6 Fuel compatibility.
Properties of the JP-8 fuels exposed to the conductive material shall meet the following
requirements listed in MIL-DTL-83133:
a.
Color shall be equal to or greater than 15.0 saybolt color units.
b.
Existent gum shall not exceed 14.0 milligrams (mg)/100 milliliters (ml).
c.
Particulates shall not exceed 1.0 mg/liter.
d.
Filtration time shall not exceed 10.0 minutes.
e.
Total acid number shall not exceed 0.015 milligram/KOH/gram.
JFTOT ΔP (260) shall not exceed 25.0 millimeters (mm) of mercury (Hg).
f.
g.
No visible extraction of material coloring pigment.
3.7.7 Electrical resistivity and electrostatic fuel impingement test.
The electrical resistivity and electrostatic compatibility characteristics of the conductive material
shall meet the following requirements:
a. The dry electrical resistivity of both classes of conductive material shall be between
1.0 x 107 and 5.0 x 1011 ohm-cm when tested at 72 ±5°F and 10, 50, 95 ± 5 percent relative
humidity. In addition, the electrical resistivity shall be measured and reported for the following
temperatures: 140, 60, 32, 10, 0, -15, -25, -30, -40, ±2°F.
b. Class I Materials. The Class I conductive materials shall not produce an incendiary
vapor ignition, electrical discharges, or excessive static charge build-up (electrical activity) when
impinged by JP-8 fuel that has a conductivity less than 10 conductivity units (cu) as well as in
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