MIL-PRF-87257B
Test Method
ASTM
FED-
Property
Test Limits
STD-
791
High temperature stability (12)
±5 max
Percent change in viscosity @ 40°C
0.1 max
Change in acid number, mg KOH/g
None
Formation of precipitate or insoluble material
Isothermal secant bulk modulus @ 40oC and 27.6 MPa
1379 min
D 6793
(4000 psig), MPa (psi)
(200,000 min)
Low temperature stability, 72 hours @ -54°C ±1°C
3458
Particulate contamination(14)
Particle count (15)
3012(16)
See table II
D 4898
Gravimetric analysis, mg/100 ml
1.0 max
Pour point, °C
-60 max
D 97 or
D 5949
Rubber swell, standard synthetic rubber, NBR-L,
19.0 to 30.0
3603
percent (17)
Storage stability (after 12 months)
3465
D 2532
Viscosity stability @ -54°C, mm²/sec
2500 max
3 hours
2500 max
72 hours
D 445
Viscosity, mm²/sec
6.7 min
@ 40°C
2.0 min
@ 100°C
550 max
@ -40°C
Water, parts per million
100 max
D 6304
Workmanship
NOTES:
(1) Qualification inspection: Shall be determined, but shall not be limiting.
(2) Conformance inspection: Shall be ±0.008 the value determined during
qualification inspection.
(3) See 4.4.6.
(4) There shall be no readily discernible difference between the color of the finished
fluid and the standard color.
(5) See 4.4.3.
(6) Compatible in all concentrations with each of the fluids approved under this
specification. Shall be miscible with MIL-PRF-5606, MIL-PRF-6083, MIL-PRF-46170,
and MIL-PRF-83282 fluids in all proportions from 54°C to 200°C. No formation of
resinous gums, sludge, or insoluble material shall occur.
7
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