MIL --- PRF --- 51527B
3.2.2 Weight. The weight of the filter set shall be no greater than 50 pounds while unpack-
aged.
3.2.3 Interchangeability. Each gas and particulate filter and any associated gasket shall be
individually interchangeable (replaceable) by one of similar form, fit and function without
modification of the filter housing.
3.3 Operating requirements.
3.3.1 Airflow resistance.
a. The airflow resistance (pressure drop) of the gas filter shall not exceed 4.5 inches
of water gage (iwg) at the rated airflow of 200 scfm. Standard conditions is defined as an air-
stream temperature of 70_F and a barometric pressure of 760 millimeters (mm) Hg.
b. The airflow resistance (pressure drop) of the particulate filter shall not exceed 0.7
inches of water gage (iwg) at the rated airflow of 200 scfm.
3.3.2 Leakage. The gas filter in the filter set 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 in gas filter shall meet all requirements in
MIL --- DTL --- 32101 for ASZM --- TEDA carbon.
3.3.6 Filtration efficiency. The particulate collection efficiency of 0.3 --- micron diameter par-
ticles shall be at least 99.97 percent when the particulate filter is challenged, at the rated air-
flow, by an aerosol.
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