MIL-PRF-46170E
TABLE I. Hydraulic fluid properties and test methods.
Test Method
Property
Test Limits
ASTM
FED-STD-
Method
791
Acid Number, mgKOH/g (max)
0.20
D664
Autoignition Temperature, C (min)
343
E659
Compatibility
See 3.4.1
See 4.5.2
See 3.4.2
D1748
Corrosion Protection (Humidity Cabinet)
Sand-blasted (3 panels) and Polished Panels (3 panels)
(100 ± 1 hours at 48.9 ± 1.1C air temperature)
Corrosiveness (Bimetallic Couple)
See 3.4.3
D6547
Corrosiveness and Oxidation Stability
D4636
(168 hrs at 121 ± 1°C)
Proc 2
Metal specimen weight change, mg/cm2 (max)(1)
Cadmium Anod(2)
±0.2
Steel Grade 1010
±0.2
Aluminum Alloy
±0.2
Magnesium
±0.2
Copper(3)
±0.6
Percent change in viscosity at 40°C (max)
±10
Change in acid number, mgKOH/g (max)
0.30
Separation of insoluble materials or gumming of the fluid
None
Evaporation Loss (22 hours at 149 ± 0.5°C), % by weight (max)
5
D972
Fire Point, C (min)
246
D92
Flash Point, C (min)
218
D92
Foaming Characteristics
D892
Foaming Tendency
Foam volume (mL) at end of 5 minute blowing period
(max)
65
At 24°C
65
At 94°C
65
At 24°C after test at 94°C
(4)
Foam Stability
Foam volume (mL) at end of 10 minute setting period
0
(max)
0
At 24°C
0
At 94°C
At 24°C after test at 94°C
High Temperature-High Pressure Spray Ignition
See 3.4.4
6052
Isothermal secant bulk modulus @ 40C and 27.6 MPa (4000
1379
D6793
(200,000)
psig), MPa (psi) (minimum)
Linear Flame Propagation Rate, cm/s (max)
0.30
D5306
6
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