MIL-PRF-46147D
4.3.4.3 Spray pattern and duration (lubricants in gas-pressurized cans only). Select a new,
unused spray container. The temperature of the spray container and the ambient air shall be
25 ± 2.0°C (77 ± 3.6°F). In a vertical position, fasten either a sheet of white paper on which two
parallel lines have been drawn 38 mm apart, or a sheet of rectangular coordinate graph paper
containing lines 38 mm apart. Position the spray container 250 ± 12.5 mm from the paper. Open
the valve fully and, with a stopwatch, determine the time required to exhaust the container. The
spray shall be effective for a minimum of 290 seconds. Measure the width of the spray pattern
using the parallel lines on the sheet of paper. Agitate the can frequently during the spray procedure
(see 3.4.3). (The effective spray is one that carries the pigment together with the resin required
for bonding.)
4.3.4.4 Curing time. Maintain the test samples from 4.3.4.3 at 25 ± 2.0°C (77 ± 3.6°F).
Examine the samples after 30 minutes (for type I lubricants) or 90 minutes (for type II lubricants)
and verify that the applied lubricant is dry to the touch IAW 3.4.4. After 18 hours (for type I) or
24 hours (for type II), subject the test samples to film adhesion test IAW ASTM D2510,
Procedure A. Lubricant shall be considered fully cured if no loss of adhesion is shown.
4.3.4.5 Solids content.
4.3.4.5.1 Lubricants in non-pressurized cans test. Stir the lubricants thoroughly to
provide a uniform dispersion. Weigh 5.0 ± 0.5 g of the lubricant into a weighing dish with a
diameter of approximately 64 mm (Fisher Scientific Co. Catalog No. 7-732 or equal). Place the
dish and contents in a force-draft oven maintained at 49 ±3.0°C (120 ± 5.2°F) for 18 ±1 hour.
Remove the dish and contents from the oven, place them in a desiccator, and allow them to cool
to 25 ± 3.0°C (77 ± 5.4°F). Remove the dish and contents from the desiccator and weigh them.
Repeat the procedure to constant weight. Calculate the percent by weight of the solid material in
the fluid lubricant from the formula:
Weight of solid materials
Percent total solids =
x 100
Weight of sample
Verify that the percent by weight of solids is not less than 24% (see 3.4.5.1).
4.3.4.5.2 Lubricants in gas-pressurized cans test. Select a new, unused spray container
for the total solids test. Place it in an upright position in a solid carbon dioxide cabinet (dry ice
cabinet) overnight to reduce the internal pressure. Remove the container from the cold cabinet
and immediately pierce a small hole in the top of the container with a sharp punch. Permit the
container to warm to 25 ± 3.0°C (77 ± 5.4°F) in an upright position, in a well-ventilated area.
When all the gas has escaped from the container, remove the top of the container. Transfer
quantitatively the contents of the container to a 600 milliliters (mL) (0.16 gal) beaker previously
weighed to the nearest 0.1 g (0.004 oz). Rinse the container twice with an appropriate solvent
(as recommended by the manufacturer) or distilled water for water based coating, and add the
rinsings to the beaker. Remove the agitator (usually a glass marble or a small steel ball) from the
beaker, rinse it with the solvent and return it to the empty container. Add the solvent rinsing
used to clean the agitator to the beaker. Place the beaker in an explosion-proof oven operated at
49 ± 3.0°C (120 ± 5.2°F). Permit the beaker to remain in the oven overnight. Remove the
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