MIL-PRF-46002D
b. Remove the remaining residue and contamination by holding the panels in a rack
at 20 degrees from the vertical and spraying downward with naphtha. Flush the
surfaces progressively downward, spraying first the test surfaces, then the backs
of the panels and finally the test surfaces again.
c. Heat the panels in boiling naphtha for 5 to 10 minutes.
d. Rinse the panels in boiling anhydrous methanol defined by ASTM D1152.
e. Inspect the panels carefully under a bright light to determine if any surface
residues remain.
f. Desiccate the panels at 25 3C and place in use within 2 hours.
NOTE: Naphtha, hexane and methanol are flammable and toxic. Do not heat either
solvent with an open flame. Avoid contact with skin and inhalation of vapor.
Perform procedures under b, c, and d in an efficient laboratory hood.
4.2.2.2.2.3 Test apparatus. The test apparatus shall consist of a screw top, wide-mouth
jar, 100 mm in height and 90 mm in diameter, as illustrated in figure 1. Bend a length of
stainless steel or Monel (TM) metal into simple framework on which the steel panel can be
suspended in a vertical position on one side of the jar. Remove any cardboard seal in the jar lid
and replace it with several pieces of filter paper to seal the jar. Use fresh filter papers for each
test. The filter paper shall be of high quality and acid-free.
4.2.2.2.2.4 Cleaning of apparatus before the test.
4.2.2.2.2.4.1 Jar lids. The jar lids shall be washed thoroughly in a water-detergent
solution, then rinsed with running water, followed by another rinse with reagent water defined by
ASTM D1193, and then wiped dry with a clean, absorbent tissue.
4.2.2.2.2.4.2 Jars, watch glasses and Monel (TM) metal framework. These items shall be
cleaned as specified below:
a. Rinse with solvent conforming to MIL-PRF-680, Type II.
b. Soak in water-detergent solution for one hour, followed by a rinse with hot,
running tap water.
c. Add 5 - 10 mL of concentrated hydrochloric acid to the jars, swirl and allow to
stand for 1 hour.
d. Expose the Monel (TM) metal framework to hydrochloric acid vapors and soak
the watch glasses in the acid.
e. Soak in water-detergent solution followed by a rinse with hot, running tap water.
f. Rinse with reagent water and dry with fresh, absorbent tissue.
4.2.2.2.2.5 Test procedure. Prepare three test assemblies for each grade of oil. Weigh a
quantity of oil, as listed in table III, onto a small, cleaned and tared watch glass, 51 to 64 mm in
diameter. The temperature of the oil and the test assemblies shall be 25 1C before the test.
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