m\) gas filter which filters out airborne toxic chemical agents as part of a Nuclear, Biological and Chemical \(NBC\) filtration system in the armored weapons systems.

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MIL-PRF-14512L(EA)

3.5.2 Leakage. The 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. A fil

ter leak is defined as the presence of 1 ppm or more of R134a in the effluent air within two

minutes after the introduction of the refrigerant at the inlet.

3.5.3 Moisture content of adsorbent. The moisture content of the adsorbent taken immedi

ately before packaging shall not exceed 3.0 percent.

3.5.4 Structural integrity. The filter shall withstand rough handling consisting of 200 drops per

minute for 15 minutes, where each drop represents a 19�millimeter fall. Sample filters shall show no

evidence of cracks, dents or structural damage, upon visual inspection after completion of testing.

3.5.5 Dimethylmethylphosphonate (DMMP) gas life (destructive). After meeting the require-

ments of 3.5.4, the filter shall have a DMMP gas life of not less than 100 minutes at rated flow (340

liters per minute) when subjected to a DMMP challenge of 2.0�0.2 milligrams per liter with an air

stream temperature of 28�3�C. Break concentration shall be 0.04 micrograms per liter.

3.5.6 Cyanogen Chloride (CK) gas life (destructive). The filter shall have a CK gas life of no

less than 30 minutes at rated flow (340 liters per minute) when subjected to a CK challenge concentra-

tion of 4.0�0.2 milligrams per liter, with an air stream relative humidity (R.H.) of 80�3 percent and

air stream temperature of 24�3�C. Break concentration shall be 5 micrograms per liter. Filters shall

be equilibrated to 80 percent R.H. prior to test.

3.5.7 Adsorbent media gas life capacity. If a material other than ASZM�TEDA adsorbent is

proposed as the adsorbent media, the material must be pre�qualified in a gas life test program in ad-

vance of First Article inspection. The qualification test program shall demonstrate to the Government

that gas life before and after environmental open�air exposure is equal or greater than that of ASZM�

TEDA carbon for agents hydrogen cyanide (AC), CK, phosgene (CG) and DMMP as listed in EA�

DTL�1704 and any additional chemical agents or simulants that are specified by the Government (see

6.5). For those agents or simulants not listed in this paragraph, the Government reserves the right to

establish gas life requirements for those agents or simulants.

3.5.8 Fines retention. Internal fines media shall retain the adsorbent in the adsorbent bed, so that

the adsorbent emission from any individual filter shall not exceed 50 milligrams.

3.5.9 Fines media. The fines media material, if made from natural cloth or any other organic

material, shall resist dampness and mildew. The material shall have a minimum spray rating of 50.0

and no visible growth of mildew on the material shall be evident after testing.

3.6 Markings. The exterior filter body shall be marked with the filter nomenclature: "FILTER,

GAS, 340 L/M, M12A2" and the lot number in a nominal 6 mm high lettering. Additional informa-