Heat Transfer Fluids
Synthetic and Thermal Hot Oils
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Military Fluids
Radcolube® 21260-10
MIL-PRF-21260 E

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(Lubricating Oil, Internal Combustion Engine, Preservative Break-In)

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-STD-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

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