MIL-PRF-83261C
4.4 Method of inspection.
4.4.1 Inspection. Refer to the contract or purchase order for specific inspection requirements.
4.4.2 Examination of the product. Sample grease (see 3.3) shall be inspected visually and a
suitable portion shall be worked with a spatula on a glass surface. After working, the grease shall be
spread with a straight edge and observed for uniformity as indicated by a smooth surface.
4.4.3 Storage stability. Penetration after the storage test shall be determined on a sample of
grease (see 3.2) which has been stored at a temperature of 38°C ± 3ºC in a 0.5 kg (1 pound), oil-tight
container for 6 months subsequent to the original determination of penetration. The unworked and
worked penetration after storage shall be determined in accordance with ASTM D217.
TABLE II. Test methods for grease
TEST METHOD
TEST
CHARACTERISTIC
PARAGRAPH
FED-STD-791
ASTM
Penetration, Unworked
D217
Penetration, Worked
D217
Storage Stability
4.4.3
Worked Stability
313.3
1/
Evaporation
D2595
1/
Oil Separation
D1742
Load Carrying Capacity
D2596
2/
Water Resistance
D1264
3/
Steel-on-Steel Wear, 52100 Steel
D2266
4/
Steel-on-Steel Wear, M-50 Steel
D2266
5/
Low Temperature Torque
D1478
1/
High Temperature Performance
D3336
Notes
1/
The test temperature shall be 232°C.
2/
The test temperature shall be 38°C ± 3°C.
3/
The test temperature for 52100 steel shall be 75°C, in accordance with AMS 6447.
4/
The test temperature for M-50 steel shall be 232°C, in accordance with AMS 6491.
5/
The test temperature shall be -73°C ± 3°C.
5
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