MIL-PRF-5606H
TABLE II. Properties of finished fluid.
Property
Test Limits Reference
Acid number, mg KOH/g (max)
0.20
Barium content, parts per million (max)
10
No. 2e
Copper strip corrosion, ASTM standard (max)
Corrosiveness and oxidation stability
(168 hrs at 135 + 1°C)
0.20
Change in acid number (max)
Metal specimen weight change, mg/cm2 (max) (1)
+0.2
Aluminum
Cadmium plated steel (2)
+0.2
Copper (3)
+0.6
+0.2
M-50 Steel
Magnesium
+0.2
Percent change in viscosity at 40°C
-5 to +20
Separation of insoluble materials or gumming of the fluid
None
Evaporation loss, percent (max)
20
82
Flash point, °C (min)
Foaming characteristics @ 24°C
Foaming tendency, ml (max)
65
(volume at end of five-minute blowing period)
Complete
Foam stability, ml (max)
Collapse (4)
(volume at end of ten-minute settling period)
4.4.3.5 &
Isothermal secant bulk modulus @ 40°C and 27.6 MPa
1379
Appendix A
(4000 psig), MPa (psi) (min)
(200,000)
Low temperature stability
See 3.5.2
Pour point, °C (max)
-60
Rubber swell, standard synthetic rubber L, percent
19.0 to 30.0
Solid particle contamination
Filtration time @ 25°C + 5°C, minutes (max)
15
Particle count
See table III
Gravimetric analysis, mg/100 ml (max)
0.3
Steel-on-steel wear (average wear scar), mm in diameter (max)
1.0
Viscosity in centistokes at -54°C (max)
2500
Viscosity in centistokes at -40°C (max)
600
Viscosity in centistokes at 40°C (min)
13.2
Viscosity in centistokes at 100°C (min)
4.90
Water, parts per million total (max)
100
(1) There shall be no pitting, etching, or visible corrosion on the surface 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 D 130
copper corrosion standard.
(4) A ring of small bubbles around the edge of the graduate shall be considered complete collapse.
6
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