Skydrol™ aviation hydraulic fluids

Your fluid choice can impact the performance of your aviation hydraulic system. That’s why you need a fluid developed to meet the requirements established by manufacturers and backed by recognized experts in phosphate ester technology. Skydrol was the first fire-resistant hydraulic fluid in the industry. Today, it remains the most advanced aviation hydraulic fluid. With Skydrol, you not only get a proven product but also access to our technical experts and unique sample analysis program.

Skydrol PE-5

Skydrol PE-5 is the first name in aviation hydraulic fluids. A Type V, fire-resistant hydraulic fluid specifically formulated to meet the changing needs of the aviation industry, PE-5 offers the longest fluid life of any phosphate ester fluid available today, even under high moisture conditions. With PE-5, you can experience less frequent fluid replacement, reducing disposal volume and decreasing your environmental footprint.
Learn more about Skydrol PE-5.

Skydrol 5

For a lighter-weight hydraulic fluid, you need Skydrol 5. With its lighter weight due to a lower density, you can save fuel and see an overall cost savings. At higher temperatures, you may experience erosion, but Skydrol 5 is the first aviation hydraulic fluid demonstrating erosion-resistance at higher temperatures so that you can experience decreased maintenance and downtime.
Learn more about Skydrol 5.

Skydrol LD-4

The world’s best-selling Type IV aviation hydraulic fluid, Skydrol LD-4, features low density, valve erosion prevention, and deposit control. Erosion resistance is made possible by a breakthrough anti-erosion additive and acid scavenger found in the formulation. For more than 35 years, there has been no change in the formulation, giving LD-4 the reputation as the premier aviation hydraulic Type IV fluid.
Learn more about Skydrol LD-4.

Skydrol 500B-4

A long service history means a proven track record for a product. Skydrol 500B-4 boasts the longest service history in phosphate ester products, and it is the only commercially available standard-density aviation hydraulic fluid. 500B-4 also offers improved erosion resistance, as it contains the same anti-erosion additive and acid scavenger as LD-4.
Learn more about Skydrol 500B-4.


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MCS-352B is a viscous assembly lubricant for components and equipment designed to use Skydrol aviation hydraulic fluids. Eastman only supplies MCS-352B in 55 gallon drums. For smaller quantities, inquiries can be directed to Boeing Distribution Services Inc. or TBM who are authorized distributors and repackage MCS-352B. Refer to the distributor listing on www.Eastman.com/Aviation for their contact information.

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Skydrol 5 offers higher temperature capability than Type IV fluids, the lowest density, and better paint compatibility.

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Skydrol™ 500B-4 is the most worker friendly of the aviation phosphate esters; it is least irritating to skin and less prone to form mists which can be irritating to the respiratory tract .

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Skydrol LD-4 features low density, excellent thermal stability, valve erosion prevention, and deposit control.

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Skydrol PE-5 was developed to meet and exceed the more demanding Type V fluid requirements. It features the longest fluid life of any commercially available fluid, low density and low viscosity at low temperature.

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