MIL-PRF-5606H
TABLE V. Test methods for hydraulic fluid properties.
FED-STD-791
Characteristic
Test Method
ASTM
Acid number
D664
Barium content
D5185
Color
D1500
1
Corrosiveness and oxidation stability
D4636
2
Evaporation
D972
3
Filtration time
3009
Flash point
D93
Foaming characteristics
D892
4
Gravimetric
D4898
Low temperature stability
3458
Pour point
D97 or D5949
5
Shear stability
D2603
Solid particle count automatic
3012
Specific gravity
D287
Storage stability
3465
6
Steel-on-steel wear
D4172
Swelling of synthetic rubber
3603
Viscosity
D445
Water
D6304
1 Test shall be run for 168 hours as 135°C. Use heptane or acetone to clean coupons. Use alternate
procedure 2.
2 Test shall be run for 6 hours at 71°C.
3 Filtration time shall be measured using a single membrane filter.
4 See 4.4.3.1.
5 See 4.4.3.3.
6 Condition B.
4.4.3.2 Color of finished fluid
The color of the hydraulic fluid shall be compared to a standard sample prepared by
adding 1 part red dye to 10,000 parts of an oil not darker than ASTM D 1500, standard
No. 1.
4.4.3.3 Shear stability
The following procedures shall be followed:
a. Follow the procedures of ASTM D 2603, with the exception of b.
b. Run the control fluid and the test fluid consecutively in the same apparatus and
under the same test conditions for 30 minutes at 0°C. The equipment is to be such that
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