MIL-DTL-53131A
4.4.2 Sampling for tests. Take samples from bulk or packaged lots (see 6.4) for tests in accordance
with ASTM D 4057 or D 4177, as appropriate.
4.4.2.1 Inspection. Perform inspection in accordance with FED-STD-791, method 9601.
4.4.2.2 Examination of filled containers. Examine samples taken in accordance with 4.4 with regard to
fill, closure, sealing, leakage, packaging, packing and marking requirements. Reject any container having
one or more defects or under the required fill. A lot shall be accepted when zero defects are found and
rejected when one or more defects are found.
4.5 Test methods. Perform tests in accordance with table V and with 4.5.1 through 4.5.2.2, as
applicable.
TABLE V. Test methods.
Requirement
Test method
Kinematic viscosity
ASTM D 445
Acid number
ASTM D 974 or D 664
Pour point
ASTM D 97
Flash point
ASTM D 92
Four-ball wear
ASTM D 4172
Evaporation
ASTM D 972
Storage stability
FED-STD-791, method 3465
4.5.1 Corrosion and oxidation stability. The corrosion and oxidation stability shall be performed at
150 °C (302 °F) in accordance with ASTM D 4636 with the modifications specified herein. The test shall
be run for 72 hours. An electrolytic grade silver test square shall be substituted for the cadmium plated
steel square The mild, carbon steel test square shall be replaced with a steel square conforming to
SAE AMS 6440. The magnesium square shall be replaced with a type 410 steel conforming to
ASTM A 240, ASTM A 666, and ASTM A 693. The viscosity at 40 °C (104 °F) shall be performed
within six hours of the completion of the oxidation test period.
4.5.2 Solid particle contamination.
4.5.2.1 Particle size. Particle size shall be measured by the use of automatic particle counters
(HIAc counter, models PC-202, PC-203, PC-305, PC-320 or equivalent) or the optical procedure
detailed in FED-STD-791, method 3009. Directions in the manual for the respective instruments shall be
followed.
4.5.2.2 Gravimetric method. A gravimetric determination shall also be made in accordance with
ASTM D 4898 using two 0.45 micrometer filter membranes.
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