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ExxonMobil Mobilgrease 28

Category Fluid , Lubricant , Clay Gellant , Polyalphaolefin (PAO)
Manufacturer
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
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Material Notes:
Mobilgrease 28 is a supreme performance, wide-temperature, antiwear grease designed to combine the unique features of a polyalphaolefin (PAO) synthetic base fluid with an organo-clay (non-soap) thickener. Its consistency is between an NLGI No. 1 and No. 2 grease. It offers outstanding performance over a wide temperature range. The wax-free nature of the synthetic base fluid, together with its low coefficient of traction compared with mineral oils, provide excellent low temperature pumpability, very low starting and running torque, and can reduce operating temperatures in the load zone of rolling element bearings. The clay thickener gives Mobilgrease 28 a high dropping point value of around 300ºC, which provides excellent stability at high temperatures. Mobilgrease 28 resists water washing, provides superior load-carrying ability, reduces frictional drag, and prevents excessive wear. Tests show that Mobilgrease 28 lubricates effectively rolling element bearings under conditions of high speeds and temperatures. Mobilgrease 28 has also shown superior ability to lubricate heavily loaded sliding mechanisms, such as wing flap screw jacks. For more than 30 years, Mobilgrease 28 has been the multi-purpose grease of choice for military and related aviation applications, worldwide.Mobilgrease 28 is designed for the lubrication of plain and rolling bearings at low to high speeds, and splines, screws, worm gears, and other mechanisms where high friction reduction, low wear, and low lubricant friction losses are required. The recommended operating temperature range is -54ºC to 177ºC (-65ºF to 350ºF) with appropriate relubrication intervals. Mobilgrease 28 is recommended for use in landing wheel assemblies, control systems and actuators, screw jacks, servo devices, sealed-bearing motors, oscillating bearings, and helicopter rotor bearings on military and civil aircraft. Subject to equipment manufacturer approvals, it can also be used on naval shipboard auxiliary machinery and where superseded specifications MIL-G-81322 (WP), MIL-G-7711A, MIL-G-3545B, and MIL-G-25760A are recommended. Mobilgrease 28 also is recommended for industrial lubrication, including sealed or repackable ball and roller bearings wherever extreme temperature conditions, high speeds, or water washing resistance are factors. Typical industrial applications include conveyor bearings, small alternator bearings operating at temperatures near 177ºC (350ºF), high-speed miniature ball bearings, and bearing applications where oscillatory motion, and vibration create problems. Mobilgrease 28 is of quality level U.S. Military Specification MIL-PRF-81322, General-Purpose, Aircraft, and U.S. Military Specification DOD-G-24508A (Navy) for shipboard auxiliary machinery. It is a U.S. Military Symbol WTR and NATO Code Number G-395 grease.
Physical Properties Metric English Comments
Kinematic Viscosity at 40°C (104°F) 29.3 cSt
29.3 cSt
ASTM D445
Kinematic Viscosity at 100°C (212°F) 9.2 cSt
9.2 cSt
ASTM D445
Oxidative Stability 100 hour
100 hour
Pressure Drop of less than 83 kPa @ 99°C; ASTM D942
500 hour
500 hour
Pressure Drop of less than 172 kPa at 99°C; ASTM D942
Evaporation Loss 6.0 %
6.0 %
22 hrs @ 177°C; ASTM D2595
Storage Temperature 38.0 °C
100 °F
6 months time; FTM 3467
Mechanical Properties Metric English Comments
Four Ball Extreme Pressure, Load Wear Index 42
42
ASTM D2596
Four Ball Wear 0.500 mm
0.0197 in
ASTM D2266
Penetration 295
295
60 Stroke Worked @ 25°C, mm/10; ASTM D217
302
302
Extended Worked Penetration Stability, 100000 Strokes, mm/10; FTM 313
Oil Separation 2.5 %
2.5 %
30 hrs @ 177°C; ASTM D6184
Thermal Properties Metric English Comments
Dropping Point 315 °C
599 °F
ASTM D2265
Descriptive Properties Value Comments
Color dark red
Copper Strip Corrosion, ASTM D4048 1B (max)
Corrosion Prevention, ASTM D1743 pass
48 hrs @ 125°F
Grease Life, DIN 51821 (FE-9), hours 400 (min)
@ 177°C
Low Temperature Torque, ASTM D1478, g-cm 800
@ -54°C, Running after 1 hr
8500
@ -54°C, Starting
Oscillation Friction and Wear, mm 6.35 (max)
Scar Dia, 35000 cycles, 90° angle, Aluminum Bronze Block
Particle Count, 25-50 microns pass, 25-74 microns, dirt count, particles/mL, FTM 3005, 0 75 micron or larger
Rubber Swell, % 6
L Type Synthetic, 1 week at 70°C
Soap/Thickener Type clay (non-soap)
Structure smooth, buttery
Water Washout, ASTM D1264, wt% 1
1 hr @ 41°C
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