MIL-PRF-46736E
4.5 Ownership and support requirements verification.
4.5.1 Washing durability. The filter element shall be installed in the air cleaner. The
efficiency at rated air flow shall be determined in accordance with 4.4.3. After completing the
initial efficiency test, dust shall be fed between a minimum rate of 1.77 g/m3 and a maximum rate
of 10 g/m3 of constant rated airflow until a restriction of 4.98 kPa (20 in. of water) is reached.
The filter element shall be removed from the housing, cleaned with compressed air, then immersed
and water agitated for 6 hours in a solution of warm water 32 + 5.5°C (90 + 10°F) and soap
conforming to P-D-245 (type I or type II) or a low sudsing commercial detergent. The filter
element shall then be removed from the solution and flushed with tap water at low pressure until
all solution and dirt are removed. The rinse water shall be flowing clean. Excess water shall be
allowed to drain from the filter element for one hour. The element shall be dried in an oven for 6
hours or until there is no change in oven weighing of the element over two consecutive 10 minute
intervals. The filter element shall then meet the efficiency requirements of 3.3.4.
4.5.2 Marking. The marking shall be visually verified (see 4.3).
4.5.3 Quality and safety. The filter element shall be visually examined for quality and
safety (see 4.3).
4.6 Operating environment requirements verification.
4.6.1 Seal ozone resistance. The test as specified in 4.6.1.1 through 4.6.1.3 shall be
performed to determine seal ozone resistance.
4.6.1.1 Test specimens. A minimum of two 5 x 2.54 x 0.16 cm test specimens shall be
subjected to the seal ozone resistance test.
4.6.1.2 Apparatus. The apparatus shall include an insulated test chamber, with an ozone-
generating source outside the chamber. Means shall be provided for measuring the ozone
concentration, for controlling the temperature of air in the chamber and for circulating air. The
apparatus shall also include a means for holding and stretching the specimens.
4.6.1.3 Procedure. Specimens shall be elongated 12.5%. The stressed specimens, while
still elongated in the stretching apparatus, shall be conditioned at room temperature for not more
than 45 minutes; and then exposed for 7 days in the test chamber in which air, having an ozone
concentration of 50 + 5 parts of ozone per 100 000 000 parts of air by volume, is circulated at a
temperature of 38 + 3°C (100 + 5°F). The specimens shall be examined frequently. There shall
be no evidence of cracks during or after exposure.
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