FED-STD-791D
6. PROCEDURE
6.1 Prepare test panel as follows:
a. Degrease the test panels in 1,1,1-trichloroethane.
b. Place template in position on the uncoated panel, trace the circumferences
of the openings in the template on to the test panel.
c. Measure the thickness of the test panels at the circled areas with a
micrometer having 0.0025-mm (0.0001-in) graduations. Note the
thickness measurement for each circled area.
6.2 Perform the test as follows:
a. Apply two coats of dry solid film lubricant by spraying the solid lubricant to the
unmarked side of the test panel. Application shall be conducted in a well
ventilated area or hood, where no flames or ignition sources are present. Care
should be taken to insure that the panel has a uniform coating of solid lubricant.
b. Air dry, temperature 25 2C (77 3F) test panel for ten minutes between
coats. After the final application, allow coated test panel to air dry for fifteen
minutes, then cure the film in accordance with specification requirements.
c. Maintain a distance of approximately 30 cm (12 in) between spray gun and test
panel while spraying.
d. Use an air pressure of 275 35 gage kPa (40 5 psig)
e. Allow test panel to reach room temperature after curing.
f. Remeasure the thickness of the test panel at the same positions.
g. Duplicate tests shall be conducted.
7. CALCULATIONS
7.1 Calculate the film thickness as follows:
F = A- B
where:
F = film thickness
A = thickness of the coated panel
B = thickness of the uncoated panel
8. REPORTING
8.1 The average of four readings shall be reported as the film thickness of the dry
solid film lubricant.
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