AeroShell Fluid 31 is a synthetic hydrocarbon-based aircraft hydraulic fluid formulated for improved fire resistance, excellent low-temperature properties, and exceptional oxidation and thermal stability.
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Shell AeroShell Fluid 31

AeroShell Grease 64 is a synthetic lithium complex grease enhanced with 5% molybdenum disulphide, designed for heavily loaded aircraft sliding components requiring superior EP performance and anti-wear protection.

Category:

Shell AeroShell Fluid 31

Advanced fire-resistant hydraulic fluid for aircraft systems

  • Synthetic hydrocarbon formulation with high flash point

  • Exceptional low-temperature performance (operates from –40°C to +205°C)

  • Superior oxidation and thermal stability

  • Provides corrosion resistance, antiwear, and anti-foaming protection

  • Red-dyed and superclean filtered for critical system compatibility

  • Compatible with AeroShell Fluids 41 and 61 and systems using MIL-PRF-5606, -6083, -87257, and -46170 fluids

  • Approved for a wide range of hydraulic systems including autopilots, brakes, servo controls, and shock absorbers

Global Product Code: 001A0048



Application:

AeroShell Fluid 31 is a synthetic hydrocarbon-based hydraulic fluid designed for aircraft, ordnance, and missile systems operating between –40°C and +205°C. It is recommended for use in components such as autopilots, flight controls, landing gear systems, brakes, shock absorbers, and hydraulic servo-controls. This fluid is increasingly adopted in place of mineral hydraulic oils due to its superior fire resistance.

Performance Features & Benefits:

  • Fire Resistant: Enhanced fire resistance versus conventional petroleum-based hydraulic fluids.
  • Excellent Temperature Range: Performs in a wide range of temperatures from –40°C to +205°C.
  • Oxidation and Corrosion Protection: Incorporates advanced additives to resist degradation and component wear.
  • Anti-Foaming: Stable performance in systems sensitive to air entrapment or cavitation.
  • System Compatibility: Dyed red and superclean filtered for compatibility with particulate-sensitive hydraulic systems.

Main Application Areas:

  • Flight control systems
  • Autopilots and servo mechanisms
  • Brakes and landing gear systems
  • Shock absorbers
  • Missile and ordnance hydraulic systems
  • Honeywell cabin air compressors (cooling turbines)

Specifications & Approvals:

  • MIL-PRF-83282D
  • DCSEA 437/A (French)
  • NATO Code: H-537
  • Joint Service Designation: OX-19

Environmental & Safety Information:

  • This product poses no significant health or safety hazard when used as recommended with proper hygiene.
  • Use impervious gloves when handling used fluid; avoid prolonged skin contact.
  • Wash skin immediately after contact with soap and water.
  • Do not discharge into drains, soil, or water. Dispose via authorised collection points.
  • Safety Data Sheet (SDS) available via inquiry

Technical Specifications:

Property Typical Value Method
Oil Type Synthetic Hydrocarbon —
Colour Red —
Specific Gravity @15.6°C 0.851 ASTM D1298
Kinematic Viscosity @205°C 1.06 mm²/s ASTM D445
Kinematic Viscosity @100°C 3.53 mm²/s ASTM D445
Kinematic Viscosity @40°C 14.3 mm²/s ASTM D445
Kinematic Viscosity @–40°C 2059 mm²/s ASTM D445
Pour Point –69°C ASTM D97
Flash Point 218°C ASTM D92
Fire Point 251°C ASTM D92
Total Acid Number 0.02 mgKOH/g ASTM D664
Evaporation Loss @205°C 10% FED-STD-791 M.350
Low Temperature Stability (72h @–40°C) Passes FED-STD-791-3458
Barium Content 0 mg/kg ASTM D5185
Gravimetric Analysis 0.2 mg/100ml ASTM D4898
Solid Particle Contamination Passes FED-STD-791 M.3009
Water Content 60 mg/kg ASTM D1744
Foaming Characteristics Seq I 65/0 ml/ml ASTM D892
Flame Propagation Passes ASTM D5306
4-Ball Wear Scar Diameter (1 kg, 75°C) 0.16 mm ASTM D4172
4-Ball Wear Scar Diameter (10 kg, 75°C) 0.22 mm ASTM D4172
4-Ball Wear Scar Diameter (40 kg, 75°C) 0.51 mm ASTM D4172
Corrosion & Oxidation Stability – Weight Change Passes ASTM D4636
Corrosion & Oxidation – Viscosity Change <10% ASTM D4636
Corrosion & Oxidation – Acid Number Change <0.02 mgKOH/g ASTM D4636

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