MIL-PRF-20092M
3.6.3 Compression resistance (for Type II, other than mattress inserts). Compression resistance of each
condition of cellular material shall be as specified in Table II.
3.6.4 Low temperature compression resistance (Type II mattress inserts only). Compression resistance
of Type II material shall not change more than 70 percent from the initial values when tested at low temperature.
3.6.5 Compression set. Compression set of the cellular material shall be not greater than 10 percent for
class 5 material.
3.6.6 Flexing. Cellular material shall withstand flexing, without physical breakdown of cellular structure.
After the flexing test, the set remaining after 1 hour at rest shall be not greater than 10 percent.
3.6.7 Accelerated aging.
3.6.7.1 Air-oven aging. After air-oven aging , the change in indentation or compression, as applicable, of
the cellular material shall be not greater than 20 percent from the values obtained before aging.
3.6.7.2 Air-pressure heat aging. Cellular material shall withstand the air-pressure heat aging test for 2
hours without changing shape, hardening, softening, or becoming tacky.
3.6.8 Fire performance.
3.6.8.1 Burning characteristics. The cellular material shall have a maximum net peak heat release rate not
greater than 150 kilowatts (kW). Burning droplets shall not be formed and drop to the floor or the top of the
weighing platform.
3.6.8.2 Smoke generation. The cellular material shall have an average specific extinction area not greater
than 300 square meters per kilogram (m2/kg).
3.6.9 Bend fatigue resistance (mattress inserts only). The cellular material shall not crack before or after
aging.
3.6.10 Tensile strength and ultimate elongation. Tensile strength of the material shall be not less than 9
2
lb/in . Ultimate elongation shall be not less than 100 percent for class 5 material.
3.6.11 Cemented seam strength. Cemented seams shall be stronger than the base material, both initially
and after oven aging.
3.6.12 Steam autoclave effect. The material shall be exposed in a steam autoclave. Exposed material
shall conform to the following requirements:
(a) Compression force deflection change - 25 percent, maximum.
(b) Constant deflection compression set - 25 percent, maximum.
3.6.13 Dynamic fatigue. Material thickness shall not decrease by more than 10 percent maximum.
3.7 Identification. Each sheet, molded or assembled shape, shall be marked in a permanent and legible
manner with the following information. If the item is too small for marking, the information shall be provided on
the wrapping or container of each item (see 6.2).
Manufacturer
Date of manufacture
Contract number and lot (if applicable)
5
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