MIL-PRF-87260B(USAF)
4.5.20 Electrical resistivity permanence.
4.5.20.1 Water immersion.
Electrical resistivity specimens, per 4.5.4, shall be immersed in pure distilled water at 120 ±5°F
for 4 weeks or until failure. A 3-week exposure at 160 ±5°F may be substituted for this
temperature (see 4.5.17.2).
4.5.20.1.1 Electrical resistivity specimens.
Sufficient electrical resistivity specimens shall be included to allow for specimen removal at
least once a week. The specimens shall be tested for initial resistivity prior to water exposure to
establish a baseline. At least one specimen shall be removed from the test environment once
weekly, and upon removal it shall be dried at 160 ±5°F until dry and then preconditioned to the
laboratory conditions for at least 30 minutes. Following preconditioning, the specimen shall be
tested per 4.5.22 and reinserted into the test environment. The distilled water shall be replaced
on a weekly basis. All initial and final electrical resistivities shall be reported, as well as all test
conditions (temperature and humidity) during resistivity measurements.
4.5.21 Fuel compatibility test.
MIL-DTL-83133 (Grade JP-8) fuels shall be exposed to the conductive material for 4 weeks at
72 ±5°F and then tested for the properties listed below. The fuels shall also be tested prior to
the exposure as indicated. The ratio of conductive material to fuel shall be approximately 1:1.
The foam color/pigment change (loss) shall be documented following exposure to verify the
requirement of section 3.4.
Fuel property
Control Test
After Exposure
a.
Saybolt color
YES
YES
b.
Total acid number
YES
YES
c.
Aromatics and olefins
YES
NO
d.
Mercaptan sulfur and total
YES
NO
e.
Distillation
YES
NO
f.
Density
YES
NO
g.
Copper strip corrosion
YES
YES
h.
Thermal stability
YES
YES
i.
Existent gum
YES
YES
j.
Filtration time
YES
YES
k.
Water reaction
YES
YES
l.
Water separation (may use
YES
YES
MicroSep or MiniSonic in place of
WSIM)
m.
Fuel electrical conductivity
YES
YES
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