MIL-DTL-83054C
airflow set to coincide with the daily reference calibration setting on the orifice differential manometer.
Next read the sample pressure drop (uncorrected) to the nearest 0.005 inch on the 4-inch manometer
(designated sample differential). The value shall then be corrected for thickness (if other than 1.00 inch
thickness) by dividing it by the measured sample thickness. This corrected air pressure drop shall then
be compared to the porosity curve (figure 2) in order to determine the average pore size for the sample
specimen. The sample pressure drop and average pore size shall be reported. Note: The porosity
values shown on figure 2 are assigned and do not necessarily relate directly to the actual number of
pores per lineal inch.
4.6.5 Tensile strength, tensile stress, and ultimate elongation tests. Tension tests including tensile
strength, tensile stress at 200% elongation, and ultimate elongation shall be conducted in accordance
with ASTM D 1564-71 entitled: "Die for Stamping Tension Specimens". The approximate size of the
dry specimen shall be 5.5 by 1 by 0.5 inches thick. For all but qualification, three specimens per sample
shall be tested. If any value deviates more than 20% from the average, two additional specimens shall
be tested and the average of all five reported. For qualification, 10 specimens shall be tested and all
values reported. In addition, a copy of the recorded traces shall be included in the test report. The
tensile strength and stress shall be reported in pounds per square inch, and ultimate elongation in
percent. Tension specimens shall be taken from the upper half of the test section, and the orientation
shall be such that the 1/2 inch dimension is always in the direction of rise (see 6.3.4) and the largest
dimension (5.5 inches) is always in the machine direction (see 6.3.5). For special fuel wet tension tests
the specimens shall be identical to those for dry testing. Specimen cross sectioned areas shall be
measured on the dry specimen prior to test fluid exposure and recorded for later usage. When testing
the specimen should be removed from the fluid prior to tension tests, drained, and immediately tested.
Do not allow the sample to air dry as it will drastically affect the test results. Original dry specimen
measurements taken prior to fluid exposure shall be used for calculating the wet tensile strength.
4.6.6 Tear resistance test. Three specimens shall be tested, in accordance with ASTM-D3574 (suffix
G) using a crosshead speed of 20 inches per minute. Dry specimen size shall be 6x1x1 inch where the
6-inch dimension is in the machine direction and the slit cut is parallel to the direction of rise. The tear
resistance shall be reported in pounds per lineal inch of thickness. Specimens shall be cut from l-inch
thick slabs of material. For fuel wet tear resistance tests the specimen shall be tested immediately after
removal from the fluid. Original dry specimen measurements taken prior to fluid exposure shall be used
for calculating the wet tear resistance.
4.6.7 Constant deflection compression set test. Three specimens shall be tested in accordance with
method B of ASTM-D3574 at a 50% deflection. Sample size shall be 4x4x3 inches. The three
specimens shall be cut from the same 3-inch-thick slab located in the middle of the test section (bun)
height and adjacent to the specimens used in the compression load deflection test specified (see 4.6.8).
The specimens shall be tested (compressed) in the direction of rise (3-inch dimension). Results for all
specimens shall be reported in percent of original thickness.
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