MIL-PRF-3150E
4.4.2 Removability. To determine conformance to 3.4.2, the oil shall be tested by
completely immersing the three oil-coated test panels used for the humidity protection test (see
4.5.1) in a breaker containing degreasing solvent IAW MIL-PRF-680, Type II at 25° C and
agitating the solvent slightly for not more than one minute. Then, repeat this process with
methanol IAW ASTM D1152. After removal from the solvent, the test panels shall not show
evidence of any oil residue, stain, or discoloration.
4.5 Environmental verifications.
4.5.1 Humidity protection. After 30 days (720 hours) of exposure to high humidity IAW
ASTM D1748, visually examine the three test panels to which the oil was applied in compliance
with requirements of 3.5.1.
4.5.2 Salt-spray resistance. Prepare the test panels by cleaning and sand-blasting as
specified in ASTM D1748. Immerse the panels in the test oil for one minute with mild agitation
and drain them for 2 hours ±10 minutes at 24 ± 3 °C. Expose the panels for 48 hours to a spray
of 5% salt (NaCl) solution as specified in ASTM B117. The panels shall be supported 10-20°
angle from vertical with the 4 inch edge with the two holes facing down during exposure to the
salt spray. Adjust the fog-collection rate to 0.75 to 2.0 ml per hour. At the completion of the
exposure period, rinse the panels first in water, then in methanol as specified in D1152, and clean
them by immersion in hexanes. Finally, rinse the panels in methanol and examine them to
determine conformance to 3.5.2.
4.5.3 Accelerated stability. Fill a pour-point jar conforming to ASTM D97 to the mark
with test oil, stopper it, and subject the oil to the following test sequence:
TABLE IV. Stability test sequence
TIME(hours + 10 minutes)
TEMPERATURE
54 ± 3°C
2
4 ± 3°C
2
54 ± 3°C
2
4 ± 3°C
2
25 ± 3°C
16
54 ± 3°C
8
4 ±3°C
64
25 ± 3°C
4
At the completion of the test sequence, turn the pour-point jar to a horizontal position and
observe the rate of flow. Then, pour the oil into an appropriate suspended level viscometer for
transparent liquids conforming to those listed in ASTM D446 Standard Specifications and
Operating Instructions for Glass Capillary Kinematic Viscometers and allow it to stand for one
hour at 40 °C. Make consecutive viscosity determinations IAW ASTM D445 until three such
determinations yield values that agree within 0.2 centistokes. Report the average value of these
determinations as the viscosity of the oil (for the purpose of determining stability only). Then,
compare the value to the initial viscosity of the oil to determined conformance to 3.5.3.
8
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