MIL-PRF-14107D
rate of 5 + 0.2 liters per hour. Pass the gases which escape through
the reflux condenser into a trap containing 50 + 1 ml of 0.1 normal
KOH diluted to 150 ml of distilled water or water of equal purity.
Conduct the test for a total of 168 + 1 hours. At the end of the test
period, remove the test tube and condenser assembly from the bath,
disassemble it and remove the metal specimens. Wash the metal
specimens with reagent grade benzene and reagent grade acetone. Weigh
the specimens. Examine the oxidized oil visually for insoluble
materials and gumming. Determine the viscosity of the oxidized oil at
-65o + 0.2oF (-53.9o + 0.1oC). Determine the neutralization number of
the oil by ASTM Method D974. If this method does not provide a
definite end point, the alternate procedure described in 4.3.3.2.3
may be used. Determine the acid number of the volatile components
(material collected in the trap) as specified in 4.3.3.2.4.
4.3.3.2.3 Alternate procedure for neutralization number. Weigh 10 ±
0.5 grams of oil to the nearest 0.1 gram into a 300 ml Erlenmeyer
flask and add 50 + 1 ml of neutralized reagent grade ethyl alcohol.
Agitate the flask thoroughly, heat it to boiling and cool it to room
temperature. Remove the oil layer by decantation. Heat the alcohol
phase in the flask to boiling and titrate to the end point using
phenolphthalein as the indicator. If the end point is in doubt add 50
+ 2 ml of boiling neutralized distilled water or water of equal
purity and observe the solution for the end point color. If
necessary, additional titration will produce the desired color which
marks the end point.
4.3.3.2.4 Acid number of volatile components. Determine the acid
number of the volatile components formed by the oxidation of the oil
by back titration of the solution in the potassium hydroxide trap.
Add a known amount of 0.1 normal sulfuric acid, approximately 10% in
excess of the potassium hydroxide contained in the solution. Boil the
mixture for 5 + 1 minutes under a reflux condenser. Remove the reflux
condenser and titrate the hot solution with standard 0.1 normal
potassium hydroxide using phenolphthalein indicator.
4.3.3.2.5 Test parameters. After completing the test, the following
determinations shall be made:
a. The change in weight of the copper and steel shall not exceed
0.2 mg per square centimeter of surface.
The viscosity of the oil at -65o + 5oF (-54o +2oC) shall not
b.
exceed 1200 centistokes.
The neutralization number of the oil shall not have increased
c.
by more than 0.5 mg KOH from the oil's original
neutralization number.
The neutralization number of any volatile components formed
d.
shall not exceed 0.5 mg KOH.
There shall be no visual evidence of separation of insoluble
e.
materials or gumming of the oil.
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