MIL --- PRF --- 51526B
3.2.3 Interchangeability. Each particulate filter and any associated gasket shall be individ-
ually interchangeable (replaceable) by one of similar form, fit and function without modifica-
tion of the gas filter or filter housing.
3.3 Operating requirements.
3.3.1 Airflow resistance. The airflow resistance (pressure drop) of the filter shall not ex-
ceed 0.7 inches of water gage (iwg) at the rated airflow of 200 scfm. Standard conditions is
defined as an airstream temperature of 70_F and a barometric pressure of 760 millimeters
(mm) Hg.
3.3.2 Filtration efficiency. The particulate collection efficiency of 0.3 --- micron diameter
particles shall be at least 99.97 percent when the filter is challenged, at the rated airflow, by
an aerosol.
3.4 Environmental requirements.
3.4.1 Hot/cold temperature. After temperature conditioning at --- 50 and 160 °F, the par-
ticulate filter shall show no ignition or structural damage, and shall pass airflow resistance
(3.3.1) and filtration efficiency (3.3.2) requirements.
3.4.2 High humidity. After conditioning at 80% relative humidity or above and 113 _F for
7 days, the particulate filter shall pass airflow resistance (3.3.1) and filtration efficiency (3.3.2)
requirements.
3.4.3 Structural integrity.
3.4.3.1 Structural deformation. The particulate filter shall be capable of withstanding
repeated applications of a quasi --- static mechanical load of 12900 newtons (2900 pounds) in
the axial direction. Each gasket shall not become dislodged from the filter by the process of
loading a filter into a housing and removing it. After testing, the filter shall meet the filtration
efficiency requirement in 3.3.2.
3.4.3.2 Shock. After shock treatment, the particulate filter shall pass airflow resistance
(3.3.1) and the filtration efficiency (3.3.2) requirements.
3.4.3.3 Vibration. After sinusoidal vibration between 4 and 50 Hz, the particulate filter
shall pass airflow resistance (3.3.1) and the filtration efficiency (3.3.2) requirements.
3.4.3.4 Rough handling. After rough handling, consisting of two hundred 3/4 --- inch drops
per minute for 15 minutes, the particulate filter shall show no evidence of cracks or dents, and
shall pass airflow resistance (3.3.1) and filtration efficiency (3.3.2) requirements.
3.4.4 Fungus. The materials of construction, except for ASZM --- TEDA carbon, shall not
support fungus and mildew growth beyond trace levels.
3.4.5 Corrosion. Any construction material shall resist salt fog corrosion to an extent
equal or greater than anodized aluminum when the aluminum alloy number is in the 3000 to
5000 series of ASTM B209.
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