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AEROSHELL FLUID 61
AeroShell Fluid 61 is a synthetic hydrocarbon base
hydraulic fluid
specifically inhibited to provide excellent oxidation
stability for the oil and
good corrosion preventive protection to the
hydraulic system.
APPLICATIONS
AeroShell Fluid 61 is designed for use
where a fire resistant preservative
grade hydraulic fluid is required and is
suitable for operational use as well
as preservation of components during
storage and shipment.
AeroShell Fluid 61 has an operating temperature range
of –40°C to
+204°C.
AeroShell Fluid 61 is compatible with AeroShell Fluids
4, 31, 41, 51 and
71.
AeroShell Fluid 61 is a synthetic oil and should not
be used in contact with
incompatible seal materials. Refer to the General
Notes at the front of this
section for further information.
Chlorinated
solvents should not be used for cleaning hydraulic components
which use
AeroShell Fluid 61. The residual solvent contaminates the
hydraulic fluid and
may lead to corrosion.
SPECIFICATIONS
U.S. Approved MIL-PRF-46170C Type
I*
British –
French –
Russian –
NATO Code H-544
Joint Service
Designation –
*The US specification covers two grades, Type I and Type II.
The only
difference between the two grades is that Type II is dyed red for
aerospace
use whereas Type I is undyed.
www.shell.com/aviation
202
Hydraulic Fluids
PROPERTIES
MIL-PRF-46170C TYPICAL
Type I
Oil Type –
Synthetic
Hydrocarbon
Kinematic viscosity mm2/s
@ 100°C 3.4 min
3.71
@ 40°C 19.5 max 15.43
@ –40°C 2600 max 2488
@ –54°C Report
15022
Flashpoint
Cleveland Open cup °C 218 min 233
Fire
Point
Cleveland Open Cup °C 246 min 248
Acid or Base number mgKOH/g 0.2
max 0.07
Evaporation loss 22 hrs
@149°C % m 5.0 max 2.39
Relative
density @ 15.6/15.6°C – 0.859
Pourpoint °C –54 max Below –54
Water Content
ppm 500 max 278
Auto-ignition temperature °C 343 min 354
Colour Undyed
Undyed
Particle Count, Automatic, per Lt
5 to 25 μm 10000 max 1414
26
to 50 μm 250 max 39
51 to 100 μm 50 max 4
Over100 μm 10 max 0
Table
continued
NOTES
The AeroShell Book
Edition 18 2003
205
Hydraulic
Fluidswww.shell.com/aviation
204
Hydraulic
Fluids
PROPERTIES MIL-PRF-46170C TYPICAL
Type I
Trace sediment mg/l
0.005 max 0.001
Rubber swell,
168 hrs @ 70°C % swell 15 to 25
21.5
4-Ball Wear, 75°C scar dia, mm
10 kg load/1200 rpm 0.3 max 0.23
40
kg load/1200 rpm 0.65 max 0.38
Galvanic corrosion Must pass
Passes
Oxidation & corrosion stability
168 hrs @ 121°C
– metal
weight change Must pass Passes
– viscosity change @ 40°C % 10 max Less than
10
– change in acidity mgKOH/g 0.3 max Less than 0.3
Low temperature
stability Must pass Passes
Rust prevention Must pass Passes
Flammability
Must pass Passes
A viscosity/temperature curve is shown at the end of this
section.
