MIL-PRF-87260B(USAF)
respect to the candidate material color. The test may be conducted in conjunction with the JP-8
fuel immersion test. A resistivity specimen, per 4.5.4, shall be marked with the selected marking
pen, and then exposed to the 160°F JP-8 immersion environment for 4 weeks. The
identification marking used shall be "590-51B" and shall be 1/2 inch to 2 inches in height. Color
photographs shall be taken of the specimens both before and after exposure. The exposed
specimens and the photographs shall be submitted to the qualifying activity for evaluation.
4.5.26.1 Test report.
The test data and photographs shall be included in the qualification report. In addition, all
specimens tested shall be submitted to the qualifying activity.
4.5.27 Electrostatic charge dissipation test.
The material shall be evaluated for its ability to dissipate static charges as a function of time.
The charge dissipation test measures the time required for a test specimen to dissipate a 5000
volt charge to 10 percent of the initial value (500 volts). The static decay times of the material(s)
shall be determined at temperatures of -25, 10, and 72°F.
4.5.27.1 Test equipment.
The test equipment necessary to determine the status decay properties should include the
following:
a. A static generator (voltage generator capable of supplying 5000 volts) used to apply
the charge to the foam sample under test.
b.
Isoprobe non-contact voltmeter (used to monitor the voltage on the sample under
test).
c. Environmental chamber, capable of controlling humidity down to 10 percent and
temperatures from -40 to +80°F.
4.5.27.2 Specimen preparation, conditioning and mounting.
a. Test specimen shall be 18.0 inches x 18.0 inches x 1.0 inch ±0.1 inch. The 1 inch
dimension shall be cut along the direction of foam rise.
b. Prior to testing, specimens shall be conditioned at least 24 hours in an atmosphere
uniformly maintained at room temperature and a relative humidity of 12 ±5 percent.
c. Each specimen, when tested, shall be mounted vertically between the electrodes and
the wing nuts shall be tightened in such a manner to insure intimate contact with the electrode
surfaces without causing visible distortion or compression of the specimen.
d. For qualification, the static decay and static decay uniformity shall be established by
evaluating a standard bun of the finished material at several locations (four minimum), and from
various positions in the bun (top, middle, and bottom of the bun height).
4.5.27.3 Specimen test procedure.
The following procedure shall be used to determine the voltage decay times at each of the
specified temperature conditions:
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