MIL-PRF-24794A
TABLE V.
Group C inspection.
Inspection
Requirement
Test
Index of refraction
3.5.2
4.6.2
Shelf life
3.5.3
4.6.3
Storage temperature
3.5.4
4.6.3
Operating temperature
3.5.5
4.6.4
Flow resistance
3.5.6
4.6.5
Water absorption
3.5.7
4.6.6
4.5.3.1.1 Sampling plan. Every 60 months, a number of units of the same
PIN, sufficient to complete all of the inspections, which have passed group B
inspection, shall be selected.
4.5.3.1.2 Failures. One or more specimen or sample unit failures shall
constitute group C inspection failure.
4.5.3.1.3 Disposition of sample units. Sample units that have been
submitted to group C inspection shall not be shipped..
4.5.3.1.4 Noncompliance. Requirements regarding failure of group C
inspection shall be as identified in the contract (see 6.8.2).
4.6
Methods of inspection.
4.6.1 Appearance (see 3.5.1). The index matching material shall be placed
between two microscope slides and formed into a layer with a thickness of
approximately 0.5 mm (0.02 inch). The material shall be visually inspected
for conformance to 3.5.1.
4.6.2 Index of refraction (see 3.5.2). The index matching material shall
be tested using an Abbe refractometer and a sodium light source, or equivalent
(refer to ASTM D542 for guidance).
4.6.3 Shelf life/storage temperature (see 3.5.3 and 3.5.4). The index
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matching material shall be exposed to a temperature of +85 C ± 2 C for 240
hrs. After exposure, the material shall be subjected to the tests specified
in 4.6.1 and 4.6.2.
4.6.4 Operating temperature (see 3.5.5). The index matching material shall
be prepared as specified in 4.6.1 and subjected to the temperatures and
durations specified in table VI. The humidity shall be controlled during the
temperature reduction and the low temperature exposure steps to eliminate the
formation of frost on the material. The index matching material shall be
visually examined during the high temperature exposure, during the low
temperature exposure, and after the test for conformance to 3.5.1.
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