MIL --- PRF --- 51525B
4.3 Conformance inspection.
4.3.1 Lotting. A lot shall consist of gas filters produced by one manufacturer at one plant,
from the same materials, by the same process, and without a break in production of more than
10 calendar days. Any one lot of gas filters shall contain no more than one lot of adsorbent
media. Each lot shall be identified and controlled in accordance with MIL --- STD --- 1168.
4.3.2 Sampling. Inspection and test of random samples shall be conducted in accordance
with the classification of characteristics in 4.3.5, and when specified in Table II.
4.3.3 Inspection procedure. Every item in the lot shall be inspected for critical characteris-
tics. Sample filters shall be examined and tested in accordance with the classification of charac-
teristics in 4.3.5. If a filter is found that does not conform to any characteristic inspected 100%,
such as leakage and pressure drop requirements, the non --- conforming filter shall be rejected
and removed from the lot. For characteristics other than leakage and pressure drop, failure of
any sample filter to conform to any characteristic in the classification of characteristics based on
the sampling and acceptance criteria specified therein shall be cause for rejection of the lot rep-
resented (see footnote, Table II).
4.3.3.1 Filter inspection. Each gas filter shall be examined for identification markings,
workmanship, and safety hazards. Each gas filter shall then be tested for airflow resistance and
leakage. Following leakage, airflow resistance, and moisture content testing, sample filters
shall be packaged using the same methods, materials, equipment, and processes as will be used
during regular production and then forwarded to the Government for additional inspection
(see 4.3.5 and table III, classification of characteristics). Any sample filters forwarded to the
Government for testing shall be packaged such they will be protected from moisture in the air.
4.3.4 Inspection characteristics. Critical characteristics are characteristics whose noncon-
formance to specified requirements is likely to result in hazardous or unsafe conditions for indi-
viduals who use or maintain the product. Characteristics whose nonconformance to specified
requirements is likely to prevent performance of the tactical function of a major end item are
also critical characteristics. Major characteristics are characteristics whose nonconformance to
specified requirements is likely to result in failure or to reduce materially the usability of the
item for its intended purpose. Minor characteristics are characteristics whose nonconformance
to specified requirements is not likely to reduce materially the operation or usability of the item
for its intended purpose.
4.3.5 Classification of characteristics. Conformance examinations and tests shall be as spe-
cified in Table III. When specified herein, accept on "0" and reject on "1" attributes sampling
inspection shall be performed on the designated characteristics using the stated levels in Table
II for selection of sample sizes.
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