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. This product is only supplied through distributors. North America region inquiries can be directed to TBM and Europe region inquiries to Boeing Distribution Services. Both distributors are authorized to repackage and distribute MCS-352B within their respective regions. 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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