Skydrol™ 500B-4 is a legacy fire-resistant phosphate ester-based aviation hydraulic fluid trusted across the aerospace industry for its proven reliability, exceptional stability, and fire safety performance. As one of the earliest and most widely used Skydrol formulations, 500B-4 continues to serve in commercial, military, and general aviation aircraft requiring robust protection and consistent performance.

Performance highlights include:

• Phosphate ester fire-resistant formula, ensuring superior flame suppression and safety under extreme operating conditions

• Excellent thermal and oxidative stability, preventing sludge and varnish buildup for longer component life

• Exceptional corrosion and wear protection, protecting pumps, valves, and actuators from damage

• Reliable performance across wide temperature ranges, ensuring smooth system operation in various flight environments

• Approved by major aircraft manufacturers, making it a trusted standard for global MRO operations

Packaged in a case of six 1-gallon cans, this format is ideal for aviation maintenance crews, repair facilities, and fleet operators seeking a convenient and manageable supply size. Skydrol 500B-4 delivers consistent performance, safety, and dependability for both modern and legacy aircraft systems.