Mobilgrease 33

Name: Mobilgrease 33
Brand: Mobil

Ester-free and offensive odor-free

With a 10-year shelf life ? offering more than three times the life of similar-type competitive greases ? Mobilgrease 33 grease helps our partners optimize their shelf-life management programs, enabling potential cost savings.

Mobilgrease 33 is a high-performance, BMS3-33C multipurpose airframe grease uniquely formulated with a proprietary blend of polyalphaolefin (PAO) base oils and lithium complex soap. Unlike other commercially available BMS3-33C greases, this unique formulation is ester-free, providing superior performance and hydrolytic stability, excellent resistance to thermal and oxidative degradation and exceptional wear protection in heavy loaded pressure environments without an offensive odor. Our ester-free blend offers exceptional performance in wet environments to resist water washout and evaporation loss, protecting the grease from the deteriorating effects of hydrolysis.

Common grease point applications

Outboard and inboard flaps
Outboard and inboard slats
Ground/flight spoilers
Elevators and stabilizers
Landing gear bushings
Rudders
Ailerons

Features and Benefits

The lithium complex thickener system provides excellent structural stability and resistance to water wash-out. Polyalphaolefin base oil is used in Mobilgrease 33 because of its exceptional thermal/oxidative resistance potential, low volatility, and superb low-temperature capability, without the potential vulnerability of an ester base oil to degradation from reaction with water. The synthetic polyalphaolefin base oil offers excellent low-temperature mobility/pumpability and very low starting and running torque values. In addition, the state-of-the art additive system in Mobilgrease 33 provides superior rust and wear protection and load-carrying capacity compared to aviation greases that meet the minimum requirements of the MIL-PRF-23827 specification.

Mobilgrease 33, with its unique features, provides the following advantages and potential benefits:

Features	Advantages and Potential Benefits
High viscosity index polyalphaolefin basestock	Very wide operating temperature range - outstanding high and low temperature performance. Excellent lubricant film protection at high temperatures
Good storage stability	Grease structure integrity maintained - low oil separation
Exceptional resistance to thermal and oxidative degradation	Long grease and lubricated part service life
Low volatility	Little vulnerability to significant base oil loss by evaporation in service
Resistance to degradation by water (hydrolysis)	No risk of corrosion induced by acidic base oil degradation products
Excellent protection against wear, corrosion, and rusting	Excellent bearing and component protection
Extreme-pressure characteristics	Prevention of excessive wear, even under shock load
High resistance to water washout	Excellent grease performance in adverse weather and other water-exposure conditions

Applications

Mobilgrease 33 is a true multipurpose aviation grease intended for use in highly loaded anti-friction bearings, gears, and actuators as well as instruments, high speed bearings (though not recommended for wheel bearings), and general airframe lubrication, over operating temperatures from ?100�F to 250�F (?73�C to 121�C). It can be used in all applications for which the aircraft manufacturer specifies U.S. Military Specification MIL-PRF-23827, Type I (Grease, Aircraft and Instrument, Gear and Actuator Screw, Grease thickened with metallic soap), Boeing BMS 3-33C (Grease, Aircraft, General Purpose), and Airbus AIMS09-06-002/SAE AMS3052 (Grease, General Purpose, Airframe, Low Temperature Range, Lithium Thickened). Mobilgrease 33 is listed in the Qualified Products List of Airbus, Boeing, and the U.S. Military for these specifications. The NATO Code Number for Mobilgrease 33 is G-354.

Properties and Specifications

Property
Grade	NLGI 1.5
Al/Ni Bronze Corrosiveness, 24 h, 100 C, Rating, SAE AMS3058 3.2.7.b	PASS
Base Oil Viscosity of Greases @ 100 C, mm2/s, AMS 1700	3.2
Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS 1697	12.5
Boeing Dynamic Bearing Life, cycles, BMS 3-33	PASS
Bomb Oxidation, Pressure Drop, 100 h, kPa, ASTM D942	11
Color, Visual	Blue Green
Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048	1B
Dirt, # particles 25u to 74 u, FTM 3005	0
Dirt, # particles 75u or larger, FTM 3005	0
Dropping Point, �C, ASTM D2265	255
EMCOR Rust, 3% NaCl, IP 220	0,0
Evaporation Loss, 22 h, 100 C, mass%, ASTM D2595	1
Evaporation Loss, 500 h, 121 C, mass %, ASTM D2595	8.7
Four-Ball Extreme Pressure Test, Weld Load, kgf, ASTM D2596	700
Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266	0.4
Fretting Wear, mg, ASTM D4170	0.6
Gear Wear Test, 2.3 kg load, 1000 cycles, gear wt loss, mg, FTM 335 (mod)	1.1
Gear Wear Test, 4.5 kg load, 1000 cycles, gear wt loss, mg, FTM 335 (mod)	1.6
High Temperature Performance, Hrs at 121 C, h, ASTM D3336	2,200+
Load Carrying Capacity, Load-Wear Index, kgf, ASTM D2596	110
NBR-L, AMS 3217/2 Compat, 70C 158 h, vol %, FTM 3603	12.6
Odor, OLFACTORY	PASS
Oil Separation, 30 h @ 100 C, mass%, ASTM D6184	4
Oxidation Stability, Pressure Drop, 500 h, kPa, ASTM D942	25
Penetration, 60X, 0.1 mm, ASTM D217	292
Penetration, Unworked, 0.1 mm, ASTM D217	285
Rust Protection, 48 h @ 125 F, Rating, ASTM D1743	0,0,0
Texture/Consistency, VISUAL	PASS
Timken OK Load, lb, ASTM D2509	55
Water Washout, Loss @ 38 C, wt%, ASTM D1264	3
Water Washout, Loss @ 79 C, wt%, ASTM D1264	6
Pen Worked X 100,000, 1/16" holes, 0.1 mm, FTM 313	330
Low Temperature Torque, Starting @ -73 C, Nm, ASTM D1478	0.52
Low Temperature Torque, Running @ -73 C, Nm, ASTM D1478	0.06

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Mobilgrease 33

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