MIL --- PRF --- 51525B
3.2.3 Interchangeability. Each gas filter and any associated gasket shall be individually in-
terchangeable (replaceable) by one of similar form, fit and function without modification of the
filter housing.
3.3 Operating requirements.
3.3.1 Airflow resistance. The airflow resistance (pressure drop) of the filter shall not exceed
4.5 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 Leakage. The gas filter shall not leak when a concentration of 1000 parts per million
(ppm) of R --- 134a (1,1,1,2) tetrafluoroethane refrigerant is introduced at the filter inlet.
3.3.3 CK gas life. Each carbon adsorbent sample obtained from the filling process of the
filter shall have a cyanogen chloride (CK) life of no less than that specified in MIL ---
DTL --- 32101 for unaged carbon.
3.3.4 DMMP gas life. Following filter rough handling, the dimethyl methylphosphonate
(DMMP) gas life shall be as follows when the influent concentration is 5000 mg/m3 at rated
flow:
(a) The mean DMMP gas life minus 1.6 times the standard deviation of the filters shall be no
less than 70 minutes.
(b) No individual sample filter shall have a DMMP gas life of less than 60 minutes (see 6.9).
3.3.5 Adsorbent media. The adsorbent media shall meet the requirements in MIL ---
DTL --- 32101 for ASZM --- TEDA carbon.
3.4 Environmental requirements.
3.4.1 Hot/cold temperature. After temperature conditioning at --- 50 and 160°F, the gas filter
shall show no ignition or structural damage, and shall pass airflow resistance (3.3.1) and DMMP
gas life (3.3.4) requirements.
3.4.2 Structural integrity.
3.4.2.1 Structural deformation. The gas filter shall be capable of withstanding repeated
applications of a quasi --- static mechanical load of 2,900 pounds in the axial direction. Each gas-
ket shall not become dislodged from the filter by the process of loading a filter into a housing
and removing it. After load testing, the filter shall pass airflow resistance (3.3.1) and DMMP
gas life (3.3.4) requirements.
3.4.2.2 Shock. After shock treatment, the gas filter shall pass the DMMP gas life require-
ment (3.3.4).
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