​​Skydrol™ aviation hydraulic fluid is the most advanced aviation hydraulic fluid supported by recognized experts in phosphate-ester fluid technology. The Skydrol line of fire resistant hydraulic fluids includes Skydrol™ 500B-4, Skydrol™ LD-4, Skydrol™ 5 and Skydrol™ PE-5. Skydrol PE-5 was developed to meet the Type V hydraulic fluid requirements developed by Airbus, Boeing, and hydraulic fluid manufacturers.