MIL --- PRF --- 51525B
3.5.3.5 Sharp edges. Filters shall be free from burrs and sharp edges that might injure per-
sonnel, damage filter media, or damage Mission Oriented Protective Posture (MOPP) IV
gloves during handling.
3.5.4 Identification markings. All markings shall be accessible, legible and permanent.
(a) The filter shall contain markings on the outside surface which include the name "FIL-
TER, GAS, 200 CFM", contract number, lot number, serial number, national stock number,
cage code, manufacturer's name, and manufacture date. Letters shall be at least 0.2 inch high.
(b) The filter shall also contain a barcode from which the following may be read: name,
contract number, lot number, serial number, national stock number, cage code, manufacturer's
part number, manufacture date, expiration date, and measured airflow resistance and penetra-
tion percent. Barcode dimensions and characteristics shall comply with MIL --- STD --- 130.
3.5.5 Workmanship.
(a) The filters shall be free from foreign matter (dirt, oil, or viscous materials).
(b) The filter units shall be free from cracked, bent, or dented metal sections, and abraded
gaskets.
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 19 filters 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 approval in accordance with the terms
of the contract.
4.2.2 Inspections to be performed. Unless otherwise specified by the terms of the contract,
the sample first article items shall be subjected to all of the verifications specified in this specifi-
cation. Verification of requirements shall be by examination, (examination includes visual in-
spection with or without simple commercial measuring devices), demonstration, test data, or by
Certificate of Compliance (COC) with analysis or supporting evidence. The Government re-
serves the right to accept or reject each COC. First article filters shall be inspected according
to Figure 2, or as determined by the Government (see 6.2). Each filter shall be examined for
interface characteristics, identification markings, workmanship, and safety hazards. Each filter
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