Military Fluids
MIL-PRF-87257 B
Formerly MIL-PRF-87257 A
Radcolube® FR257 HYDRAULIC FLUID
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(Hydraulic Fluid, Fire Resistant, Low Temperature, Synthetic Hydrocarbon Base)

Radco Industries, Inc.	Qualification Number: MLB 03-17
PO Box 305	Qualification Date: 15OCT2003
LaFox, IL 60147	Manufacturing Location: LaFox IL
Telephone: (800) 854-4865	Fax: (630) 232-7968

DESCRIPTION	REQUIREMENT	TYP. RESULT	TEST METHOD
Kinematic Viscosity, Centistokes
@ 40 °C, minimum	6.7 cSt	7.0 cSt	ASTM-D455
@ 100 °C, minimum	2.0 cSt	2.2 cSt	ASTM-D455
@ -40 °C, maximum	550 cSt	460 cSt	ASTM-D455
Evaporation loss, max 135°C, 6.5 hours	20 wt %	10 wt %	FED-STED-791C Method 350
Specific Gravity, 15.6°C	0.8427+/- 0.008	0.84	ASTM-D1298
Pour Point, °C, max	-60°C	< -65°C	ASTM-D97
Flash Point, °C, minimum	170°C	175°C	ASTM-D92
Fire Point, °C, minimum	180°C	190°C	ASTM-D92
Total acid number, max.	0.20 mg KOH/gm	<0.1 mg KOH/gm	ASTM-D974
Water content, ppm	<100 ppm	40	ASTM-D1744
Particulate Contam. Size
5 to 15	< 10,000 max	1200	ASTM-F312
16 to 25	1,000 max	50	ASTM-F312
26 to 50	150 max	10	ASTM-F312
51 - 100	20 max	0	ASTM-F312
> 100	5 max	0	ASTM-F312

Radcolube® FR257 is a military qualified synthetic fire resistant hydraulic fluid consisting of synthetic hydrocarbon base oils and additives. Designed for safe use in low temperature aircraft and missile hydraulic systems, Radcolube® FR257 demonstrates excellent low temperature properties, oxidative stability, and fire protection in both military and industrial/commercial applications.
Radcolube® is a trademark of RADCO INDUSTRIES, INC.

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MIL-PRF-87257B