Typical Physical Characteristics

PROPERTIES			MIL-PRF-24139A	TYPICAL
Oil type			Mineral	Mineral
Thickener type			_	Microgel
Base oil viscosity	mm2/s
@ 40°C			–	35
@ 100°C			–	5.5
Useful operating temperature				–40 to
range		°C	–
				+121
Drop point		°C	149 min	260+
Worked penetration @ 25°C			265 to 320	300
Unworked penetration
@ 25°C			–	287
Bomb oxidation pressure
drop @ 99°C
100 hrs		lb/in2	10 max	9
		2
500 hrs		lb/in	25 max	15
Oil separation @ 100°C,
in 30 hrs		% m	–	0.7
Water resistance test loss
@ 38°C		% m	5 max	2.0
Evaporation loss in 22 hrs
@ 121°C		% m	–	1.3
Mean Hertz Load		kg	30	35
Antifriction bearing
performance
@ 121°C		hrs	–	2000+
Copper corrosion 24 hrs @
100°C			Must pass	Passes
Bearing protection 2 days @
51°C			Must pass	Passes
Colour			–	Brown

Specifications

AeroShell Grease 6 is a general purpose airframe grease for use in anti-friction bearings, gearboxes and plain bearings within the temperature range of –40°C to +121°C