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)

tion may be required by solicitation. The distance between the lines of lettering shall be a nominal

9.5�mm. The marking shall be black paint or ink.

3.7 Workmanship.

3.7.1 Safety. Filters shall be free from sharp edges and burrs that might injure personnel or dam-

age Mission Oriented Protective Posture (MOPP) IV gloves during handling.

3.7.2 Appearance. Filters shall be free from foreign matter and cracked, dented or bent sec

ctions.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classi

fied as follows:

(a) First article inspection (see 4.2)

(b) Conformance inspection (see 4.3)

4.2 First article inspection.

4.2.1 Sample. The first article sample shall consist of 20 consecutively produced filters

which pass airflow and leakage requirements (3.5.1 and 3.5.2). The first article sample shall be

manufactured using the same methods, materials, equipment, and processes as will be used

during regular production. The first article sample shall be submitted for inspection and ap

proval in accordance with the terms of the contract.

4.2.2 Inspection procedure. Unless otherwise specified by the terms of the contract, the

sample first article items shall be subjected to any or all of the examinations and tests specified

in this specification and be inspected for compliance with all of the requirements of the applica

ble packaging requirements.

4.2.2.1 For examination. The sample filters shall be examined for all visual and measurable

requirements of this specification.

4.2.2.2 For test. Samples of at least 100 grams each of adsorbent shall be taken during the filling

of the first, tenth and twentieth filters and placed in separate open containers whose diameters are

such that the depth of the carbon will be 38�13 mm deep. Those samples of adsorbent shall be ex-

posed to the same conditions of temperature and humidity as their associated filters. Each filter shall

be tested for airflow resistance (4.3.6.1) and leakage (4.3.6.2). Six of the 20 filters shall then be tested

in accordance with the fines retention test (4.3.6.8), and dampness and mildew resistance tests

(4.3.6.9) after being examined for workmanship. Following leakage testing, the 14 remaining accept-

able filters shall be packaged using the same methods, materials, equipment, and processes as will be

used during regular production. Concurrent with or immediately following the packaging of the fil-