AeroShell Fluid 31 is a synthetic hydrocarbon-based hydraulic fluid engineered for aircraft systems, offering exceptional fire resistance, thermal stability, and low-temperature performance across a wide operating range.
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AeroShell Fluid 31

AeroShell Fluid 31 is a synthetic hydrocarbon-based hydraulic fluid engineered for aircraft systems, offering exceptional fire resistance, thermal stability, and low-temperature performance across a wide operating range.

Category:

AeroShell Fluid 31

Fire-resistant synthetic hydraulic fluid for aircraft systems

  • Synthetic hydrocarbon base oil with high flash point and oxidation stability

  • Outstanding low-temperature flow properties (operational from -40°C to +205°C)

  • Formulated with advanced additives for corrosion resistance, antiwear, and anti-foaming protection

  • Superclean filtered to support particulate-monitored hydraulic systems

  • Dyed red for identification and leak detection

  • Compatible with AeroShell Fluids 41, 61, and MIL-spec fluids (MIL-PRF-5606, 6083, 87257, 46170)

  • Not suitable for use with incompatible seal materials (consult material compatibility)

  • Approved for use in Honeywell cooling turbines and military aircraft hydraulic systems

Global Product Code: 001A0048



Application:

AeroShell Fluid 31 is a high-performance synthetic hydrocarbon hydraulic fluid specifically developed for use in aircraft, missile, and ordnance systems operating between -40°C and +205°C. Its advanced formulation offers exceptional fire resistance, oxidation stability, and compatibility with synthetic elastomer seals and modern hydraulic systems.

Performance Features & Benefits:

  • Fire Resistant: High flash and fire points provide improved safety compared to conventional mineral oils.
  • Wide Temperature Range: Maintains fluidity and function from -40°C to +205°C.
  • Advanced Additive System: Provides antiwear, corrosion inhibition, oxidation resistance, and anti-foam properties.
  • Superclean Filtration: Optimized for use in particulate-sensitive and servo-controlled hydraulic systems.
  • Fluid Compatibility: Fully compatible with AeroShell Fluids 41 and 61 and MIL-PRF-5606, 6083, 87257, and 46170.
  • Special Use Cases: Approved for Honeywell (Garrett) cabin air compressors and military aircraft systems.

Main Application Areas:

  • Aircraft hydraulic systems
  • Flight control actuators, shock absorbers, and autopilot systems
  • Missile and ordnance hydraulic mechanisms
  • Military aviation hydraulic systems replacing mineral oils
  • Cabin air compressors (Honeywell/AlliedSignal)

Specifications & Approvals:

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

Environmental & Safety Information:

  • AeroShell Fluid 31 is safe to handle with proper hygiene practices and personal protection.
  • Avoid contact with skin; use gloves and wash hands thoroughly after use.
  • Do not discharge into drains or the environment. Dispose of through authorised oil collection services.
  • 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 @ -40°C 2,059 mm²/s ASTM D445
Kinematic Viscosity @ 40°C 14.3 mm²/s ASTM D445
Kinematic Viscosity @ 100°C 3.53 mm²/s ASTM D445
Kinematic Viscosity @ 205°C 1.06 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 @ -40°C (72 hrs) Passes FED-STD-791-3458
Barium Content 0 mg/kg ASTM D5185
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 (1 kg / 1200 rpm) 0.16 mm ASTM D4172
4-Ball Wear (10 kg / 1200 rpm) 0.22 mm ASTM D4172
4-Ball Wear (40 kg / 1200 rpm) 0.51 mm ASTM D4172
Corrosion & Oxidation Stability (metal weight change) Passes ASTM D4636
Viscosity Change (168 hrs @ 121°C) <10% ASTM D4636
Acid Number Change (168 hrs @ 121°C) <0.02 mgKOH/g ASTM D4636

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