MIL-PRF-81329D
a. The panels shall be made from:
(1) Aluminum alloy in accordance with QQ-A-250/5 and anodized in accordance with
MIL-A-8625, type I, measuring 0.4 x 76.2 x 152.4 mm.
(2) Corrosion resistant steel in accordance with SAE-AMS5510, measuring
0.9 x 76.2 x 152.4 mm.
b. The panels shall be pre-cleaned using aliphatic naphtha in accordance with TT-N-95. The
stainless steel panels shall be sandblasted with 120 grit steel. The surface of the panel shall be
held at a distance of 63.5 mm from the discharge nozzle (orifice opening of 6.35 mm diameter)
delivering grit at an air pressure of 550 to 620 kPa. After the panels have been sandblasted, the
panels shall be cleaned with a aliphatic naphtha trichloroethane rinse and dried with a stream of
dry air that is free of oil. A spray application shall be used to coat the panels with the lubricant for
the tests of this specification (see 6.3). Two or three coats may be required to reach the desired
dry film thickness of 0.025 to 0.035 mm (see 6.4). Air drying, at a temperature of 25 + 3 °C for
ten minutes, shall be allowed between coats. After the final coat has been applied, the coated
panels shall be allowed to air dry for 30 to 35 minutes. The coated panels shall then be heated to
80 + 1 °C for 120 to 125 minutes followed by 120 to 125 minutes at 150 + 3 °C. The coated
panels shall be allowed to cool to room temperature. At least two coated panels shall be used in
each test method requiring test panel specimens.
4.5.2 Film appearance test. The bonded solid film lubricant specimens shall be examined
visually at a magnification of 12X for surface imperfections (see 3.3.1).
4.5.3 Film thickness test. Film thickness shall be determined by a magnagauge or by the
difference in thickness as measured between an unlubricated anodized aluminum panel and the
same panel coated with the dry film lubricant. To ensure measurements in the same portion of the
panel, a template shall be made the same size as the panel with a total of four 9.5 mm holes,
centered 38 mm in from each 76.2 mm edge and 15.9 mm in from each 152.4 mm edge. Using a
precision micrometer with a 0.0025 mm graduation, the thickness shall be measured at each
opening in the template with the template in position on the uncoated panel. After the dry film
has been applied to the panel and cured, the thickness shall be re-measured at the same positions.
The difference in the readings represents the film thickness of the lubricant. The film thickness
shall be not greater than 0.025 mm nor less than 0.035 mm.
4.5.4 Film adhesion test. Four bonded anodized aluminum panels (see 4.5.1) shall be tested
in accordance with ASTM-D2510. A uniform powdery deposit clinging to the tape shall not be
objectionable.
4.5.5 Thermal stability test. The thermal stability test shall be run over a temperature range
of -185 to 400 °C in accordance with ASTM-D2511.
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