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Aeroshell 33MS An Extreme pressure (EP) Grease - MIL-G-21164D

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Aeroshell 33MS An Extreme pressure (EP) Grease - MIL-G-21164D
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Material Safety Data Sheets (MSDS): MSDS1
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Material Safety Data Sheets (MSDS): MSDS1
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Material Safety Data Sheets (MSDS): MSDS1

AeroShell Grease 33MS comprises AeroShell Grease 33 fortified with 5% molybdenum disulphide. It possesses the enhanced anti-wear and anti-corrosion properties of AeroShell Grease 33 with the added EP (Extreme Pressure) properties provided by the addition of a solid lubricant. The useful operating temperature range is –73°C to +121°C.

AeroShell Grease 33 has established itself as the answer to most of the airframe’s General Purpose, airframe greasing requirements, being approved for use in Boeing, Airbus and many other aircraft types. It sets the standard with exceptional anti-corrosion and anti-wear performance while allowing aircraft operators to shrink their grease inventory and reduce the risk of misapplication. However, there remains a small number of highly loaded, sliding applications on the airframe where the additional boost of molybdenum disulphide will always be required. To address this need, Shell Aviation has developed AeroShell Grease 33MS. Sharing the same advanced grease technology as its parent, AeroShell Grease 33MS also possesses the extreme pressure (EP) characteristics provided by molybdenum disulphide.

AeroShell Grease 33MS contains a synthetic oil and must not be used with incompatible seal materials.

  • U.S.: Approved MIL-G-21164D
  • British: Approved DEF STAN 91-57
  • French: Equivalent DCSEA 353/A
  • Russian: N/A
  • NATO Code: G-353
  • Joint Service Designation: XG-276
  • Specifications
  • Oil type: Synthetic hydrocarbon/Ester
  • Thickener type: Lithium Complex

    Base oil viscosity mm2/s

  • @ -40°C: 1840
  • @ 40°C: 14.2
  • @ 100°C: 3.4
  • Useful operating temperature range °C: –73 to +121
  • Drop point °C: 234
  • Worked penetration @ 25°C: 281
  • Unworked penetration @ 25°C: 288

    Bomb oxidation pressure drop from 758 kPa (110 PSI)@ 99°C

  • 100 hrs KPa (psi): 10.3
  • 500 hrs KPa (psi): 34.5
  • Oil separation @ 100°C in 30 hrs % m: 2.29
  • Water resistance test loss (79°C)% m: 3.39
  • Evaporation loss in 22 hrs @ 100°C % m: 0.65

    Low Temperature Torque @ -73°C

  • Starting Torque Nm: 0.50
  • 1 hr running torque: 0.060
  • Anti-friction bearing performance @ 121°C hrs: Greater than 1000
  • Extreme pressure properties – load wear index: 57.49
  • Copper corrosion 24 hr @ 100°C: 1b
  • Bearing protection 2 days @ 52°C: Passes, no corrosion

    Storage Stability 6 months @ 40°C

  • Unworked penetration: 226
  • Worked penetration: 289
  • Change in penetration from original: 8
  • Color: Dark grey
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