AeroShell Grease 22 Synthetic Aviation Grease
AeroShell Grease 22 is a synthetic aviation grease formulated for aircraft components operating under heavy loads, high speeds, broad temperature changes, and exposure to water. It is formulated with a synthetic hydrocarbon base oil, a clay thickener, and additives that provide oxidation and corrosion resistance, anti-wear protection, and load-carrying performance.
This versatile aircraft grease is commonly used in wheel bearings, landing gear components, engine accessories, actuators, control systems, and other high-load or high-speed lubrication points. Its useful operating temperature range of -54°C to +177°C (-65°F to +350°F) supports aircraft maintenance in both low-temperature and high-temperature operating environments.
AeroShell Grease 22 is approved to MIL-PRF-81322G and MIL-PRF-24508B.
Key Features
- Synthetic hydrocarbon aviation grease
- Useful operating temperature range of -54°C to +177°C (-65°F to +350°F)
- Designed for high bearing loads and high operating speeds
- Resists oxidation and corrosion
- Supports anti-wear and load-carrying performance
- High resistance to water washout
- Long grease retention in demanding applications
- Suitable for a broad range of aircraft lubrication points
Recommended Applications
AeroShell Grease 22 may be specified for:
- Aircraft wheel bearings
- Landing gear assemblies
- Engine accessories
- Control systems
- Actuators
- Screw jacks
- Servo mechanisms
- Electric motors
- Helicopter rotor bearings
- Aircraft instruments
- Airframe lubrication points
- Hinge pins
- Static joints
- General anti-friction bearings operating at high or low temperatures
Application suitability depends on the aircraft, component, seal materials, and manufacturer requirements.
Specifications and Approvals
- MIL-PRF-81322G
- MIL-PRF-24508B
- DEF STAN 91-52 (British)
- NATO Code G-395
- Joint Service Designation XG-293
- DCSEA 395/A (French)
- COMAC QPL-CMS-OL-301
- Analogue of CIATIM 201 and 203
- Analogue of VNII NP 207, ERA (VNII NP 286M), and ST (NK-50)
Approval status can change. Confirm the current specification, OEM approval, and product documentation when compliance is required.
Typical Technical Characteristics
| Property |
Test Method |
Typical Value |
| Oil type |
Not specified |
Synthetic hydrocarbon |
| Thickener type |
Not specified |
Clay |
| Color |
Visual |
Amber |
| Base oil viscosity at -40°C |
Not specified |
7,500 mm²/s |
| Base oil viscosity at 40°C |
Not specified |
30.5 mm²/s |
| Base oil viscosity at 100°C |
Not specified |
5.7 mm²/s |
| Useful operating temperature range |
Not specified |
-54°C to +177°C |
| Dropping point |
ASTM D2265 |
Greater than 300°C |
| Worked penetration at 25°C |
ASTM D217 |
283 |
| Water washout at 41°C |
ASTM D1264 |
2.0% mass |
| Evaporation loss at 177°C for 22 hours |
ASTM D2595 |
1.1% mass |
| Anti-friction bearing performance at 177°C |
ASTM D3336 |
Greater than 400 hours |
| Load-carrying capacity |
ASTM D2596 |
40 kg |
| Copper corrosion after 24 hours at 100°C |
ASTM D4048 / FED-STD-791 5309 |
Passes |
Frequently Asked Questions
What is AeroShell Grease 22 used for?
AeroShell Grease 22 is used for aircraft wheel bearings, engine accessories, landing gear components, control systems, actuators, screw jacks, servo mechanisms, electric motors, rotor bearings, hinge pins, and other aircraft lubrication points operating under demanding conditions.
Is AeroShell Grease 22 suitable for aircraft wheel bearings?
Yes. Aircraft wheel bearings are one of its primary applications. The grease is formulated for high loads, high speeds, temperature changes, water exposure, and the rapid heating that can occur during landing and braking. Use it only when AeroShell Grease 22 or its applicable specification is identified in the maintenance documentation.
What is the AeroShell Grease 22 temperature range?
Its useful operating temperature range is -54°C to +177°C, which is equivalent to approximately -65°F to +350°F.
Is AeroShell Grease 22 MIL-PRF-81322G approved?
Yes. AeroShell Grease 22 is listed by the manufacturer as approved to MIL-PRF-81322G. It is also listed under MIL-PRF-24508B and several international and aircraft-manufacturer specifications.
Can AeroShell Grease 22 be mixed with another aircraft grease?
Mixing is not recommended unless compatibility has been confirmed by the equipment manufacturer or a qualified technical authority. Incompatible thickeners or base oils can change grease consistency, oil separation, mechanical stability, or protective performance. Purging or cleaning may be required during a product change.
What makes AeroShell Grease 22 different from other AeroShell greases?
AeroShell Grease 22 is formulated with a synthetic hydrocarbon base oil and clay thickener for aircraft components exposed to heavy loads, high speeds, broad temperature changes, and moisture. Other AeroShell greases may use different base oils, thickeners, temperature ranges, or additive systems and may be intended primarily for airframe, instrument, or specialized high-temperature applications.
Is AeroShell Grease 22 resistant to water washout?
Yes. The product is intended for applications where high resistance to water washout is required. Its typical ASTM D1264 water washout result is 2.0% mass at 41°C.
Is AeroShell Grease 22 compatible with all seals?
No. Its synthetic hydrocarbon base oil may be incompatible with certain seal and elastomer materials. Verify seal compatibility before applying the grease.
What AeroShell Grease 22 package sizes does Petroleum Service Company offer?
Petroleum Service Company offers AeroShell Grease 22 in several package configurations for different aircraft maintenance and fleet requirements:
- 10-tube case (SKU: 550067096-10)
- 30-tube case (SKU: 550067096)
- Case of four 6.6 lb cans (SKU: 550043633)
- 17 kg pail (SKU: 550043616)
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