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|  MIL-L- 24131C(SH)
(a)
Appearance - The film shall be examined visually.
(b)
Adherence - Adherence shall be determined by rubbing the dry film with the finger, using
moderate pressure.
(c)
Spalling - Spalling shall be determined by sharply tapping the metal surface with the edge of a
spatula while the metal is held above a white surface. The metal shall be tapped in an area of
the metal surface not coated with lubricant.
4.3.3.1.2 Irregular surface. A single coat of lubricant shall be brushed on the threads of a 3/4-10
steel machine bolt and permitted to dry for at least 5 minutes to determine compliance with table I. The
threads shall be dry, clean, and free of rust and scale. Film properties shall be examined as follows:
(a)
Appearance - The film shall be examined visually.
(b)
Adherence - Adherence shall be determined by running an unlubricated 3/4-10 nut on and off
the bolt by hand.
(c)
Spalling - Spalling shall be determined by tapping the head of the bolt with a spatula while the
bolt is held upright above a white surface.
4.3.4 Quality conformance tests.
4.3.4.1 Particle size. The particle size shall be determined optically by the following procedure or
by an equally accurate alternate procedure which has been approved in writing.
4.3.4.1.1 Procedure. Dilute a sample of the thoroughly mixed lubricant with isopropanol to yield a
mixture with 0.2 weight percent solids. Place one drop of the thoroughly mixed diluted lubricant on a
microscope slide and immediately protect the lubricant by placing a cover glass over it. Place a drop of
immersion oil on the cover glass and place the microscope slide with cover glass on the stage of a
microscope with lighting furnished through the window in the stage and through an Abbe type condenser or
equal. Bring the oil immersion lens into contact with the drop of oil and observe the lubricant particles at
1000 diameters. Make a search of the drop of lubricant in areas thin enough to permit inspection of the
separated particles.
4.3.4.2 Total solids. Total solids (non-volatile) shall be determined in the following manner or by
an equally accurate alternate procedure which has been approved in writing.
4.3.4.2.1 Procedure. Dry a clean Vycor evaporating dish at 570F 5F for approximately 30
minutes, cool in a dessicator and determine its tare weight to 0.0001 gram. Repeat this step until
constant weight is obtained. Mix the contents of the bulk lubricant container thoroughly. Weigh
approximately 3 grams of lubricant to 0.0001g into the tared Vycor dish. Allow bulk solvent to
evaporate overnight at room temperature in a clean, well ventilated area prior to any heating of sample.
Heat the Vycor dish and lubricant contents to 230F 5F for 1.5 hours in a ventilated laboratory oven.
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