[Information Post] Comprehensive Analysis of AeroShell Ultra-Clean Hydraulic Oils

Aeroshell hydraulic oil

• AeroShell Fluid 41

• AeroShell Fluid 31

• AeroShell Fluid 51

• AeroShell Fluid 61

• AeroShell Landing Gear Hydraulic Oil (LGF)

Hydraulic Oil Cleanliness 

    Ultra-Clean Characteristics Hydraulic oil users strive to ensure optimal performance and extend the lifespan of their hydraulic equipment. One way to achieve this is to reduce wear on hydraulic system components. Many factors contribute to wear, the most common being particulate matter in the hydraulic oil.

   The latest versions of MIL-PRF-5606, MIL-PRF-6083, MIL-PRF-46170, MIL-PRF-83282, and MIL-PRF-8725 require hydraulic oils to be “ultra-clean.” Ultra-clean means that particulate matter in the hydraulic oil is strictly controlled. Over the years, hydraulic systems and components have become smaller while operating pressures have increased. Therefore, particulate matter in the hydraulic oil is more likely to cause valve sticking, impact corrosion, wear, and nozzle and pipe blockage, leading to system failure. Thus, these specifications impose very strict limits on particulate matter.

01:AeroShell Hydraulic Oil Products

• AeroShell Fluid 41 is a mineral hydraulic fluid with ultra-clean properties, offering a wider range of applications;

• AeroShell Fluid 31 is a synthetic hydrocarbon flame-retardant hydraulic fluid, gradually replacing mineral hydraulic fluids;

• AeroShell Fluid 51 is a low-temperature synthetic hydrocarbon flame-retardant hydraulic fluid;

• AeroShell Fluid 61 is a corrosion-resistant synthetic hydrocarbon flame-retardant hydraulic fluid;

• AeroShell LGF is a hydraulic fluid specifically designed for certain aircraft landing gear shock absorber struts;

02:Main requirements for aircraft hydraulic fluid

■ Low freezing point

■ Minimal viscosity change with temperature

■ Good corrosion and oxidation stability

■ Good sealing compatibility

■ Shear stability

■ Ultra-clean

■ Flame retardant

■ Good anti-foaming properties

■ Good low-temperature and/or high-temperature stability

In addition, most aviation hydraulic fluid specifications also specify other requirements for hydraulic fluid type or related application.

03:Hydraulic oil cleanliness - ultra-clean properties

    AeroShell Fluid 31 Synthetic Hydrocarbon-Based Aircraft Hydraulic Fluid

    AeroShell Fluid 31 is a synthetic hydrocarbon-based aircraft hydraulic fluid with significantly improved flame retardancy compared to conventional petroleum products.

    AeroShell Fluid 31 uses specially designed base oils with a relatively high flash point, excellent low-temperature performance, and good oxidation and thermal stability. Furthermore, AeroShell Fluid 31 incorporates high-tech additives to provide antioxidant, corrosion-resistant, wear-resistant, and anti-foaming protection.

    AeroShell Fluid 31 undergoes ultra-clean filtration to ensure optimal performance for particulate monitoring systems.

    Operating temperature range: –40°C to +205°C (–40°F to +401°F).

    AeroShell Fluid 41 is a mineral hydraulic oil with ultra-clean properties.

    Its manufacturing process prioritizes cleanliness and improves fluid performance.

    AeroShell Fluid 41 utilizes additives that provide excellent low-temperature fluidity, anti-wear properties, oxidation and corrosion resistance, and shear stability.            Furthermore, this high viscosity index hydraulic oil contains metal deactivators and foam inhibitors to enhance performance in hydraulic applications.

    AeroShell Fluid 41 can operate over a wide temperature range.

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