MIL-PRF-87260B(USAF)
4.5.5, three specimens tested in accordance with the steam autoclave exposure test as
specified in 4.5.15, and three additional specimens shall be tension-tested while fuel-wetted in
accordance with 4.5.5. Prior to dry tension and steam autoclave testing, the specimens shall be
rinsed in petroleum ether, dried for 30 minutes at 160 ±5°F, and cooled at room temperature.
Wet tension tests shall be run immediately after removal from the test fluid. All values for
original, final (dry and wet), and percent change of tension properties shall be reported. The
wet tensile property change shall be calculated using the initial (time = 0) wet tension values as
a baseline.
4.5.16.2 Electrical resistivity test.
In addition to the tension tests of 4.5.16.1 electrical resistivity tests shall be conducted using
specimens defined in 4.5.4. A total of six specimens shall be exposed to the fuel and at each 2-
week interval a specimen shall be removed, washed in petroleum ether, dried, and then tested
per 4.5.22. The specimens shall also be tested initially, prior to immersion into the fuel. At each
4-week interval the fuel shall be changed. All values for original and final electrical resistivity
shall be reported along with the test conditions (temperature and humidity) that existed during
the electrical resistivity tests. The electrical resistivity tests shall be in accordance with the
procedures for production specimens defined in 4.5.22.
4.5.16.3 Immersion tests.
Fuel (JP-8) immersion tests in accordance with 4.5.16b shall be accomplished in containers
sufficient to provide complete immersion for all tension, CLD, and tear specimens. Following
the 4-week exposure at 72 ±5°F (room temperature), three specimens shall be immediately
tested for wet tension properties in accordance with 4.5.5, wet CLD properties in accordance
shall be reported and the percent change from the original dry test properties shall be
to establish the percent change in properties due to fuel-wetting.
4.5.17 Hydrolytic stability tests.
The following tests shall be conducted to characterize the hydrolytic stability of the material:
4.5.17.1 Humidity exposure.
Tension and electrical resistivity specimens shall be exposed to 200 ±5°F and 95 ±5 percent
relative humidity for 12 weeks or until failure, whichever occurs first.
4.5.17.1.1 Tension tests.
Tension tests shall be conducted in loosely capped standard glass quart jars using 50 ml of
distilled water for each 900 ml of container volume and a maximum of nine tension specimens
for each sampling jar. Specimens shall be supported above the water and the water level shall
be maintained throughout the test. A minimum of three specimens for each exposure time shall
be tensile tested. In addition, electrical resistivity tests shall be conducted using specimens
defined in 4.5.4. Sufficient specimens shall be used to allow samples to be removed at least
once a week in order to determine the failure point for the conductive treatment or coating. All
resistivity specimens shall be measured initially (prior to exposure) to establish property
changes due to testing. The test specimens shall be removed, drained free of water, blotted dry,
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