MIL-PRF-87260B(USAF)
4.4.3.1
Rejection and test.
Failure of any of the test specimens to conform to the process control requirements specified
herein shall require a retest of one additional set of test specimens for the property that failed
from the same test section. In the event of failure of any of the retested specimens, production
shall be halted and no additional material accepted until the reason for failure has been
determined and corrective action taken. The qualifying activity shall be notified of any test
failures encountered.
4.5
Test methods.
4.5.1 Examination of product.
Each finished bun of material shall be visually inspected for consistency of cell structure, color,
complete reticulation, obvious voids, or surface imperfections and the dimensional tolerances
specified in 3.8 prior to final packaging. Criteria for rejection of buns shall be any exterior
surface defects that could seriously affect the end function of the product, such as:
a.
Excessive cleaves, voids, or splits.
b. Holes larger than 1/2 inch in diameter and 1/2 inch in depth, not to exceed four per
bun and no closer together than 2 feet.
c. Level of non-reticulation not to exceed 0.40 percent of the total surface area or 0.07
percent of the total volume, based on the standard size bun.
4.5.2 Color test.
Testing for color shall be by visual analysis. The material shall be of a uniform color. Any
unusual color variations over the foam surface shall be cause for rejection, especially distinct
surface darkening due to dirt, contamination, or surface deterioration or any color mottling. The
color of the product is not limited except that it shall not be blue, orange, yellow, or red.
4.5.3 Density test.
One test specimen shall be tested in accordance with ASTM D3574 (Test A). Specimen size
shall be 3 inches x 7 inches x 10 inches, such that the 3-inch dimension is in the direction of the
The results shall be reported to the nearest 0.1 pound per cubic foot (lb/ft3).
4.5.3.1
Density uniformity.
The density uniformity of the product shall be demonstrated during qualification testing by
sampling a bun of product at a minimum of ten locations throughout the bun (height) top and
bottom and tested for density per 4.5.3. The specimen size shall be 3 inches x 4 inches x 10
inches. The 4-inch dimension shall be in the height direction. The density variation shall be
determined and all values reported for both buns of material.
4.5.4 Porosity (air pressure drop) test.
The pore size determination shall be by the air pressure drop technique specified herein. Two
specimens per sample shall be run for production tests and three specimens per sample for
qualification tests. The cylindrical specimen shall be 10 inches in diameter by 1 ±0.02 inch
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