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MIL-PRF-46170 Hydraulic Fluid, Rust Inhibited, Fire Resistant, Synthetic Hydrocarbon Base, Nato Code No. H-544This specification covers the requirements for one type of synthetic hydrocarbon base hydraulic fluid \(see 6.1\) for use in the -40 degrees C to 200 degrees C temperature range in recoil mechanisms and ground vehicle and equipment hydraulic systems. This hydraulic fluid will not be used for aircraft systems, aircraft ground support equipment, or the preservation of aircraft components.

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MIL-PRF-46170E
TABLE I. Hydraulic fluid properties and test methods - Continued
Test Method
Property
Test Limits
ASTM
FED-STD-
Method
791
Low Temperature Stability (-40±6°C for 72 hrs)
See 3.4.5
3458
Particulate Contamination(5)(6)
Particle Count
See Table II
3012
(7)
Gravimetric method, mg/100 mL (max)
0.5
D4898
Pour Point (°C) max
-54
D97
Relative Density @ 15.6C/15.6C
See 3.4.7
D1298
Rubber Swell, Standard Synthetic Rubber(8), NBR-L, %
15.0 to 25.0
D4289
(168 ± 0.5 hours at 70 ± 2.5C)
Steel-on-Steel wear (average wear scar), mm in diameter (max)(9)
D4172
Test Load 147N
0.30
Test Load 392N
0.65
Storage Stability (24 ± 3°C for 12 months)
See 3.4.8
3465
Trace Sediment, mL (max)
0.005
D2273
Viscosity, centistokes (mm2/s)
D445
At -40C (max)
2600
At 40C (max)
19.5
At 100C (min)
3.4
Water, mass % (max)
0.05
D6304
Water Sensitivity, Light Transmittance % (min)
90
See 4.5.1
Workmanship
See 3.4.9
1. There shall be no pitting, etching, or visible corrosion on the surface of any of the
metals when viewed under magnification of 20 diameters.
2. A slight discoloration is permitted.
3. Any corrosion (discoloration) produced on the surface of the copper shall be not
greater than No.3 of the ASTM D130 Copper Corrosion Standard.
4. There shall be no remaining foam in excess of a ring of bubbles around the edge of
the test container.
5. The container shall be thoroughly shaken immediately prior to withdrawing the
sample. Two determinations per sample are required. Each determination shall be
made on 100mL portions of the sample.
6. See 3.4.6
7. See 3.4.6.2
8. Use standard synthetic rubber NBR-L (as referenced in SAE AMS3217/2) within 6
months of date of manufacture. Store rubber under 60F.
9. Test Condition B. A different 10±0.5mL sample shall be used for each test.
3.4.1 Compatibility. The hydraulic fluid shall be compatible in all concentrations with
each of the fluids approved under this specification. The hydraulic fluid shall be miscible with
MIL-PRF-5606, MIL-PRF-6083, MIL-PRF-83282, and MIL-PRF-87257 fluids in all
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