AeroShell Fluid 41
|
|
|
AeroShell Fluid 41 is a mineral hydraulic oil manufactured to a very high level of cleanliness, and possesses improved fluid properties. AeroShell Fluid 41 contains additives which provide excellent low temperature fluidity as well as exceptional anti-wear, oxidation - corrosion inhibition and shear stability. In addition metal de-activators and foam inhibitors are included in this high viscosity index fluid to enhance performance in hydraulic applications. AeroShell Fluid 41 is capable of wide temperature range operation.
AeroShell Fluid 41 is dyed red.
APPLICATIONS
AeroShell Fluid 41 is intended as a hydraulic fluid in all modern aircraft applications requiring a mineral hydraulic fluid. AeroShell Fluid 41 is particularly recommended where use of a "superclean" fluid can contribute to improvements in component reliability, and can be used in aircraft systems operating unpressurised between –54°C to 90°C and pressurised between –54°C to 135°C.
AeroShell Fluid 41 should be used in systems with synthetic rubber components and must not be used in systems incorporating natural rubber. Refer to the General Notes at the front of this section for further information.
AeroShell Fluid 41 is compatible with AeroShell Fluids 4, 31, 51, 61 and 71 and SSF/LGF.
Chlorinated solvents should not be used for cleaning hydraulic components which use AeroShell Fluid 41. The residual solvent contaminates the hydraulic fluid and may lead to corrosion.
SPECIFICATIONS
| U.S. | Approved MIL-PRF-5606H* (both U.S. and European production) |
| British | Approved DEF STAN 91-48 Grade Superclean* (European production only) Meets DEF STAN 91-48 Grade Normal (European production only) Equivalent to DEF STAN 91-48 Grades Superclean* & Normal (U.S. production only) |
| French | Approved DCSEA 415/A |
| Russian | Analogue to AMG-10 |
| NATO Code | H-515* (equivalent H-520) |
| Joint Service Designation | OM-15* (equivalent OM-18) *Superclean grades |
The British specification DEF STAN 91-48 covers two grades (normal and superclean) of mineral hydraulic fluid which differ only in their cleanliness limits. AeroShell Fluid 41 is manufactured to meet the superclean requirements and thus it also meets the requirements of the normal grade.
| PROPERTIES | MIL-PRF-5606H | TYPICAL | ||
| U.S. Production |
European Production |
|||
| Oil type | Mineral | Mineral | Mineral | |
| Kinematic viscosity mm²/s at 100°C at 40°C -40°C -54°C |
4.90 min 13.2 min 600 max 2500 max |
6.13 15.68 384 1450 |
5.30 14.1 491 2300 |
|
| Viscosity index | -- | 214 | Over 200 | |
| Flashpoint, Pensky Martin closed cup °C |
82 min |
104 |
105 |
|
| Autoignition temperature °C | -- | 230 | 230 | |
| Pourpoint °C | –60 max | <–60 | <–60 | |
Total acid number
|
0.20 max |
0 |
0.01 |
|
| Evaporation loss 6 hrs at 71°C %m |
20 max |
16.5 |
10 |
|
| Water content (ppm) | 100 max | 55 | <100 | |
| Relative density at 15.6/15.6°C |
Report |
0.874 |
0.87 |
|
| Colour | Red | Red | Red | |
| Particulate contamination, number of particles per 100 ml in size range
|
10000 max 10000 max 150 max 20 max 5 max |
1200 550 70 5 0 |
808 116 44 10 1 |
|
| Copper corrosion | 2e max | lb | 2b | |
| Steel on steel wear, scar diam, mm |
1.0 max |
0.65 |
0.95 |
|
| Rubber swell, L rubber % | 19 to 30 | 22 | 25.4 | |
| Corrosiveness & oxidation, 168 hrs at 135°C – metal weight change – viscosity change at 40°C % – acid number change (mgKOH/g) |
Must pass –5 to +20 0.20 max |
Passes 8.08 +0.1 |
Passes 0.02 +0.1 |
|
| Low temperature stability 72 hrs at –54°C |
Must pass |
Passes |
Passes |
|
| Shear stability – viscosity change at 40°C – acid number change |
Must pass 0.2 max |
Passes Less than 0.2 |
Passes Less than 0.2 |
|
| Gravimetric filtration mg/100ml filtration time (min) |
0.3 max 15 max |
0.1 10 |
Less than 0.3 Less than 15 |
|
| Foaming tendency | Must pass | Passes | Passes | |
| Barium content ppm | 10 max | Nil | Nil | |
A viscosity/temperature curve is shown at the end of this section