MIL-PRF-87260B(USAF)
Additional quantities of material will be required at the upper and lower areas of the porosity
range for fluid retention, explosion suppression and flame arrestor testing.
4.3.1.1
Test specimens.
4.3.1.1.1 Test section location.
All test specimens shall be prepared from production material within the test section locations
specified herein.
4.3.1.1.1.1 Qualification and process control tests.
For qualification and process control tests, the test section shall consist of a full-size bun that
has been sectioned to provide for all the qualification test samples and test specimens. All
qualification test specimens used shall be from the same machine run of production material
and from the specified area defined in 4.5. Where practicable, the material used shall be
representative of the mid range in density and pore size (air pressure drop) for the given
product.
4.3.1.1.1.2 For production and lot testing.
For production and lot testing, the test section shall consist of a section approximately 15 inches
long by the normal bun height and width which has been processed along with normal
production material or taken from a production bun. Location of the specific test samples within
the test section shall be in accordance with the guidelines specified in 4.5. Specimen
measurements shall be in accordance with ASTM D3574.
4.3.1.1.2 Quantity of specimens.
Unless otherwise specified herein, three specimens per sample shall be tested. The value
reported shall be the average of those observed. If any value deviates more than 20.0 percent
from the average value, two additional specimens shall be tested and the average for all five
values shall be reported.
4.3.2 Test report, disposition of test specimens, and data for the qualifying activity.
The following shall be furnished to the qualifying activity as a qualification package:
a. Test report. A qualification test report shall be prepared in accordance with MIL-
HDBK-831 and shall include, as a minimum, the following:
(1) A tabulation of all qualification test data, including production test data on the
qualification foam run. All values obtained shall be included as well as sample calculations.
(2)
Detailed discussion of any failures, and retesting data.
b. Disposition of test specimens. All test specimens used in the qualification tests shall
be submitted to the qualifying activity (see 6.3.1), except those subjected to the following tests:
Tension test (4.5.5)
(1)
(2)
Tear resistance test (4.5.6)
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