MIL-PRF-81322G
3.3 Physical properties. Physical properties of the grease shall conform to table I when
tested in accordance with table II.
TABLE I. Physical properties.
Property
Requirement
Corrosiveness (copper strip)
1-b, max.
The grease shall show no green color in that portion
contacting the copper strip. Any corrosion produced
on the surface of the copper shall be no more than
1-b when compared with ASTM-D130 (see 6.8)
Dirt
25 to74 µm
1000 particles per milliliter of grease, max.
75 µm or larger
None
Dropping point
232 °C, min.
Evaporation, after 22 hours at 177 ± 3 °C
10.0 percent weight loss, max.
High temperature performance, at 177 ± 3 °C
400 hours, min. (average of four test runs)
Load carrying capacity (Load wear index)
30.0 min.
Low temperature torque, at -54 °C
0.98 Newton-meter (Nm), max.
Starting
0.098 Nm, max.
Running, after 60 minutes
Odor
No odor of rancidity, perfume, or free alcohol
Oil separation, after 30 hours at 177 ± 3 °C
2.0 - 8.0 percent weight loss
Oscillation
Friction and wear after 35,000 cycles
6.35 mm width of wear scar, max.
Oxidation stability, at 99 °C
83 kilopascals (kP) pressure drop, max.
In 100 hours
172 kP pressure drop, max.
In 500 hours
Rust preventive properties, ASTM-D1743 rating
Pass
Based on the pass or fail rating of at least two of
three bearings.
Steel on steel wear
0.8 millimeter (mm), max.
Based on the average wear scar diameter on the three
balls.
Storage stability, penetration:
200, min.
Unworked
Separation of crystalline material
None
Worked
± 30, max.
Swelling of synthetic rubber, NBR-L (see 6.6),
10.0 percent, max.
after 168 ± 0.5 hours at 70 ± 1 °C
Water washout, at 41 ± 1 °C
20 percent loss, max.
Worked penetration
265-320
Worked stability, penetration, after 100,000 double
350, max.
strokes
3.4 Workmanship. The grease, when examined visually, shall be a smooth and homogeneous
mixture, free from lumps and extraneous materials.
4
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