MIL-DTL-83054C
4.6.8 Compression load deflection test. Three specimens shall be tested in accordance with ASTM-
D3574 (suffix D) at the 25- and 65- percent deflection level after 1 minute at each deflection point.
Specimen size shall be 4x4x3 inches and taken near the middle of the bun height such that the 3-inch
dimension is in the direction of material rise. New material shall be aged for a minimum of 96 hours
following thermal reticulation prior to compression load deflection testing. Tests shall be conducted in
the direction of material rise. Prior to testing, the specimens shall be preflexed twice to 80%
compression. A copy of the recorded traces for each test shall be included in the test report and results
reported in pounds per square inch. For wet compression load deflection properties the test specimen
shall be tested immediately after removal from the fluid. The original dry specimen measurements taken
prior to fluid exposure shall be used for determining the wet compression load deflection properties.
4.6.8.1 Load deflection curve. For qualification and process control testing, load deflection curves
shall be recorded for the specimens specified (see 4.6.8) during both preflexing up to 80% deflection.
The recorded curves shall be submitted to the qualifying activity with the test specimens as specified
herein.
4.6.9 Fuel displacement test. One sample per test shall be run using grade JP-5 turbine fuel conforming
to MIL-DTL-5624, and the average reported as the fuel displacement. The test shall be conducted at
standard conditions using a standard 1,000 mi capacity cylinder having l 0- to 20- mi graduations. Each
specimen shall be cut into a cylindrical shape having a diameter approximately equal to that of the
graduated cylinder and a length sufficient to fill the test cylinder to the 900-ml mark. Specimens shall be
cut in the direction of the material rise (bun height). Fuel shall be added to the 900-mi mark in the
graduated cylinder and the specimen slowly added until it is completely immersed. The specimen shall
be immersed for a period of 24 hours to obtain maximum swelling effects. The new fluid level shall be
noted and the increase in milliliters shall be recorded. The displacement shall be calculated as follows:
percent Volume Displacement = milliliters increase x 100
original fluid volume
4.6.9.1 Calculated fuel displacement. The theoretical volume replacement of the material as calculated
from the following formula and based on the material density specified (see 4.6.3) shall be reported:
percent displacement (volume) = material density (lbs/ft3)x100
density of polyol(s) polymer (lbs/ft3)
4.6.10 Fuel and water retention tests.
4.6.10.1 Fuel retention tests. Fuel retention shall be determined on a 6x6x6 inch specimen using grade
JP-5 turbine fuel conforming to MIL-DTL-5624 having a specific gravity of 0.788 to 0.845. Four
specimens shall be cut from the center of the test section (bun) height directly adjacent to each other.
These shall be identified at the top surface, and two each shall be identified for the fuel retention test
specified herein and the water retention test specified (see 4.6.10.2). A porosity test specimen shall be
taken directly above the type I materiel retention specimens and tested as specified (see 4.6.4) to
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