MIL-PRF-81904C(AS)
4.3.1 Retention of qualification. Unless otherwise specified by the qualifying
activity, the time of periodic certification to retain qualification of products shall be in
two-year intervals from the date of original qualification and shall be initiated by the
qualifying activity. Requalification of thermal efficiency shall be by test and shall not be
extended beyond five years from the previous test for acquisition of new material lots.
4.4 Conformance inspections. Conformance inspection shall consist of all
examinations specified in table I and 4.4.3.
TABLE I. Conformance inspections.
Test
Requirement
Method
Characteristic
Paragraph
Paragraph
Condition in container
3.4
4.6.2
Cure time
3.5.1
4.6.3.1
Color
3.6.2
4.6.4.2
Hardness
3.6.3
4.6.4.3
Pull-Off Adhesion
3.6.5
4.6.4.5
4.4.1 Lot formation. A lot shall consist of all the coating compound produced by
one manufacturer during a period not to exceed 24 hours, at one plant, from the same
materials, and under essentially the same manufacturing conditions, provided that the
operation is continuous. In the event that the process is a batch operation, each batch shall
constitute a lot (see 4.4.1.1).
4.4.1.1 Batch. A batch is the quantity of material which has been manufactured
by some unit chemical process, or subjected to some physical mixing operation, intended
to make the final product substantially uniform.
4.4.2 Sampling for tests. Conformance test samples shall consist of one gallon
(3.79 liter) of the coating or coating system selected from each lot in accordance with
FED-STD-141, Method 1022. Each container shall be labeled with complete information
regarding the lot and batch numbers, date of sampling, contract number and applicable
specification.
4.4.2.1 Sampling for examination for container fill. A random sample of filled
containers shall be selected in accordance with ANSI/ASQ Z1.4, Inspection Level S-4,
for examinations as specified in 4.4.3.2.1.
4.4.3 Examinations.
4.4.3.1 Tests. The conformance tests shall consist of all the tests specified in 4.4
and table I. There shall be no failures.
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