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Mobilgrease™ 33

Inside component to an aircraft wing

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, BMS3-33 multipurpose airframe grease uniquely formulated with a proprietary blend of polyalphaolefin (PAO) base oils and lithium complex soap. Unlike other commercially available BMS3-33 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.

Why trust in Mobilgrease 33 aviation grease? Because it’s been specifically formulated to:

  • Help maximize inventory value with its 10-year shelf life

  • Help consolidate inventories and reduce costs with its approved use for a wide range of applications

  • Help maximize component life with its uniquely patented formulation

  • Provide exceptional structural stability in extreme conditions and in adverse environments

  • Offer exceptional performance at high and low temperatures

  • Have no offensive odor

Common grease point applications 

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

Product information

Data sheets

 

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

Resistance to degradation by water (hydrolysis)

No risk of corrosion induced by acidic base oil degradation products

Low volatility

Little vulnerability to significant base oil loss by evaporation in service

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 –100ºF to 250ºF (–73ºC to 121ºC). 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 3-33B (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.

 

Specifications and Approvals

 

Mobilgrease 33

Is Approved Against

Meets

Airbus AIMS09-06-002

               X

 

Boeing BMS 3-33B Type 1

               X

 

MIL-PRF-23827C, Amendment 2, Type I

               X

 

NATO G-354

               X

 

SAE AMS3052

 

      X

 

Typical Properties

 

Test Methods

MIL-PRF-23827 Type I Requirements

Mobilgrease 33 (1)

NLGI Grade

 

 

1 1/2

Thickener Type

 

Metallic Soap

Lithium Complex

Color

Visual

 

Blue Green

Structure/Consistency

Visual

Smooth, free from lumps and visual impurities

Pass

Odor

Olfactory

No rancid, perfume, or alcohol odor

Pass

Viscosity of Base Oil, cSt

ASTM D 445

 

 

at 40 ºC

 

 

12.5

at 100 ºC

 

 

3.2

Dropping Point, ºC (ºF)

ASTM D 2265

165 (329) min

255 (491)

Low Temp. Torque at -73ºC (-100ºF), Nm

DEF STAN 05-50 Part 62, ASTM D 1478

 

 

Starting

 

1.00 max

0.52

Running, after 1 Hr

 

0.10 max

0.06

Low Temp. Torque with 10% water at -73ºC (-100ºF), Nm

DEF STAN 05-50 Part 62, ASTM D 1478

 

 

Starting

 

 

0.67

Running, after 1 Hr

 

 

0.09

Penetration at 25ºC (77ºF), mm/10

DEF STAN 05-50 Part 63, ASTM D 217

 

 

Unworked

 

200 min

285

60 Strokes Worked

 

270-310

292

100,000 Strokes Worked

FTM 313

270-375

330

Penetration, 100,000 Strokes Worked with 10% water, mm/10

DEF STAN 05-50 Part 63, ASTM D 217

 

330

Oil Separation, 30 Hrs at 100ºC, wt %

ASTM D 6184

5 max

4

Evaporation Loss, 22 Hrs at 100ºC, wt %

ASTM D 2595

2 max

1

Evaporation Loss, 500 Hrs at 121ºC, wt %

ASTM D 2595

 

8.7

Copper Strip Corrosion, 24 Hrs at 100ºC

ASTM D 4048

1b max

1b

AMS4640 Al/Ni Bronze Corrosion, 24 Hrs at 100ºC

ASTM D 4048

 

Pass

Four Ball Wear, scar dia., 1200rpm/40kg/1hr/75ºC, mm

ASTM D 2266

 

0.4

Load Wear Index, kgf

ASTM D 2596

30 min

110

Weld Load, kgf

ASTM D 2596

 

700

Timken OK Load, lbf

ASTM D 2509

 

55

Rust Protection, 48 Hrs at 125ºF, ›1mm dia Spots

ASTM D 1743

0 in 2 out of 3 bearings

0,0,0

SKF EMCOR Rust, 3% NaCl, rating

ASTM D 6138

 

0,0

Water Washout, 1 Hr at 38ºC (100 ºF), wt %

ASTM D 1264

20 max

3

Water Washout, 1 Hr at 79ºC (174 ºF), wt %

ASTM D 1264

 

6

High Temperature Performance, Hrs at 121ºC

ASTM D 3336

1,000 min

2,200+

Oxidation Stability, pressure drop in kPa

ASTM D 942

 

 

100 Hrs at 99ºC

 

70 max

11

500 Hrs at 99ºC

 

105 max

25

Fretting Wear, mg loss

ASTM D 4170

 

0.6

Dynamic Bearing Life, No of cycles

BMS 3-33-8.2

 

Pass

Navy Gear Wear Test, mg loss/1000 cycles

FTM 335

 

 

2.3 kg load

 

2.5 max

1.1

4.5 kg load

 

3.5 max

1.6

Dirt Count, Particles/mL

FTM 3005

 

 

25-74 Micron Size

 

1000 max

0

75 Micron or Larger

 

0

0

Storage Stability, 6 months at 40ºC, Penetration, mm/10

FTM 3467

 

 

Unworked

ASTM D 217

200 min

289

60x worked

ASTM D 217

 

288

60x worked, Difference from Unworked

ASTM D 217

 

-1

Difference from Original

ASTM D 217

±30

2

Elastomer Compatibility, 168 Hrs at 70ºC, % vol change

FTM 3603

 

 

Nitrile (NBR-L, AMS3217/2)

 

 

+12.6

Thermoplastic Compatibility, 70 Hrs at 100ºC, % vol change

ASTM D 4289

 

 

Hytrel 6356 + 0.5% carbon black

 

 

3.4

Delrin 100 AF (ASTM D 4181)

 

 

+0.1

PTFE (Teflon) (AMS 3652)

 

 

+0.1

Nylatron GS

 

 

-0.5

(1) Values may vary within modest ranges

 

 

 

 

Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx

  • Airbus
  • Boeing
  • Maximize component life
  • Resists degradation
  • Extended temperature range
  • High temperature stability
  • Structural stability
  • Water resistance
  • Volatility
  • Wear protection
  • Rust protection
  • Corrosion protection
  • Friction control
  • Load carrying capabilities
  • Multi-purpose airframe grease
  • Airbus AIMS09-06-002
  • Boeing BMS 3-33B Type 1
  • MIL-PRF-23827C, Amendment 2, Type I
  • NATO G-354
  • SAE AMS3052
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