MIL-PRF-46147D
have both faces and all edges grit-blasted with 180-220 grit aluminum oxide for a surface finish
of 20-40 microinches (μin.). Phosphate the panels (weight should be 11 - 22 g/m2) IAW
MIL-DTL-16232, type M. The lubricant shall be applied IAW Appendix A in a well-ventilated
area or hood where no flame or ignition source is present. A spray application technique shall
be used to coat the panels for the tests specified herein. Test panels shall be cured at 25 ± 2.0°C
(77 ± 3.6°F) for a minimum of 24 hours. Three coats shall be the maximum number required to
obtain the specified film thickness (see 3.4.2). At least two test panel specimens shall be used in
each method. A total of two steel panels and six sets of pins and vee blocks are required for
testing IAW performance requirements.
4.3.3 Operating requirements verification.
4.3.3.1 Endurance life. Test pins and vee blocks shall be tested IAW ASTM D2625,
Procedure A to verify the minimum endurance life of 120 minutes for type I or 90 minutes for
type II (see 3.3.1). The endurance life shall be determined by averaging the results of four tests,
with the result of no individual test being less than 100 minutes for type I or 75 minutes for
type II. Prior to testing, panels shall be cleaned with aliphatic naphtha, followed by acetone or
any environmentally safe cleaner that cleans surfaces to pass ASTM F22 (see 4.3.2.3).
4.3.3.2 Load-carrying capacity test. Test pins and vee blocks shall be tested IAW
ASTM D2625, Procedure B to verify the minimum load-carrying capacity of 11 120 N (2500 lbf)
(see 3.3.2). The load-carrying capacity shall be determined by averaging the results of two tests,
with the result of no individual test being less than 8950 N (2000 lbf). The tests shall be
conducted using the 20 000 N (4500 lbf) load gage. Prior to testing, panels shall be cleaned
with aliphatic naphtha, followed by acetone or any environmentally safe cleaner that cleans
surfaces to pass ASTM F22 (see 4.3.2.3).
4.3.4 Interface requirements verification.
4.3.4.1 Film adhesion. Test panels prepared per 4.3.2.2, shall be tested IAW
ASTM D2510, Procedure A to verify that no bare metal surface is exposed (see 3.4.1). A
uniform deposit of powdery material clinging to the removed test tape shall not be considered a
failure.
4.3.4.2 Film appearance and thickness. To determine conformance to 3.4.2, the bonded
lubricant specimens shall be examined visually and microscopically at a magnification of 12X
for uniformity in color, smoothness and evidence of cracks, scratches, pinholes, blisters,
bubbles, runs, sags, foreign matter, grit, rough particles, and separation of ingredients.
4.3.4.2.1 Film thickness on aluminum panels. The thickness of bonded lubricant on
aluminum panels prepared per 4.3.2.2 shall be measured IAW ASTM B244 or ASTM D7091
to verify the thickness requirement of 0.008 to 0.013 mm (see 3.4.2).
4.3.4.2.2 Film thickness on steel panels. The thickness of bonded lubricant on steel
panels prepared per 4.3.2.3 shall be measured IAW ASTM B499 or ASTM D7091 to verify
the thickness requirement of 0.008 to 0.013 mm (see 3.4.2).
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