MIL-PRF-87257D

RADCOLUBE® FR257

HYDRAULIC FLUID, FIRE RESISTANT, LOW TEMPERATURE, SYNTHETIC HYDROCARBON BASE, AIRCRAFT AND MISSLE

Synthetic hydrocarbon base hydraulic fluid for use in the -54°C to +200°C (-65°F to 392°F) temperature range in aircraft and missile hydraulic systems.

Qualification Numbers

AFPET/PTPS 19-011
AFPET/PTPS 21-008

Qualification Date

18 July 2019
20 April 2021

Certification Number

C2021-00038

NATO Code

H-538

Shelf Life

24 Months from DOM

National Stock Numbers (NSN)

9150-01-388-7769             Quart
9150-01-386-6687             Gallon
9150-01-391-2087             5 Gallon Pail
9150-01-387-4577             55 Gallon Drum

CHARACTERISTICS
REQUIREMENT
TYPICAL RESULTS
TEST METHOD
Kinematic Viscosity,
centistokes
@ 40 °C, minimum 6.7 cSt 6.8 cSt ASTM D445
@ 100 °C, minimum 2.0 cSt 2.1 cSt ASTM D445
@ -40 °C, maximum 550 cSt 456 cSt ASTM D445
@ -54 °C, maximum 2,500 cSt 2291 cSt ASTM D445
Evaporation loss (%wt), maximum 20.0 17.0 FED STD 791-350.2
Pour Point, °C, maximum -60°C < -81°C ASTM D5949
Flash Point, °C, minimum 160°C 170°C ASTM D92
Fire Point, °C, minimum 170°C 192°C ASTM D92
Total Acid Number, maximum 0.20 mg KOH/g 0.10 mg KOH/g ASTM D664
Water Content, ppm maximum 100 ppm 11 ppm ASTM D6304
Solid Particle Contamination per 100 ml,  microns
5 to 15 10,000 max 4,034 FED STD 791D 3012
16 to 25 1,000 max 436 FED STD 791D 3012
26 to 50 150 max 108 FED STD 791D 3012
51 – 100 20 max 10 FED STD 791D 3012
> 100 5 max 0 FED STD 791D 3012

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