Skydrol Fluid

Skydrol Fire Resistant Hydraulic Fluid

​​​​Skydrol fire-resistant hydraulic fluid is the most advanced aviation hydraulic fluid supported by recognized experts in phosphate ester fluid technology. LD4 and 500B4 are sold in quart, gallon, or 5-gallon sizes. 

Skydrol LD-4, 500B4, and LD-5 are advanced phosphate ester-based hydraulic fluids commonly used in business and military aircraft, renowned for their fire-resistant properties and superior performance in demanding aviation environments. Skydrol LD-4 is known for its balanced formulation that provides excellent thermal stability, lubricity, and resistance to hydraulic system deposits, while Skydrol 500B4 offers similar benefits with enhanced anti-wear properties, making it ideal for high-stress systems. Skydrol LD-5 represents a more modern formulation designed to meet stringent environmental standards, including reduced toxicity and improved thermal stability. These fluids typically conform to specifications such as SAE AS1241 and other industry standards, ensuring compatibility with aircraft hydraulic systems. Their use highlights the aviation industry's commitment to safety and performance, particularly in applications where fire resistance and long-term reliability are paramount.