Skydrol-500B-4

Skydrol Hydraulic Oil
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About this product
Skydrol 500B-4 is a fire-resistant phosphate-ester hydraulic fluid with a proven service history dating back to the original Skydrol 500 introduced in 1952. Formulated with advanced anti-erosion additives and acid scavengers, it delivers exceptional thermal stability and longevity in aircraft hydraulic systems. The fluid’s distinctive purple color aids in leak detection, while its worker-friendly formulation minimizes skin and respiratory irritation in maintenance environments.
Skydrol-500B-4 Datasheet
UOM: EA
Stock Location: Dubai
Hazardous Item: Non-Hazardous Item
Life Limited Part: No
Lead Time: Stock
Certification: MANF COFC
8130/EASA Eligible: Yes
PRODUCT DESCRIPTION

Skydrol-500B-4

  • Exceptional Fire Resistance - Phosphate-ester base provides inherent flame-resistant properties, significantly reducing fire risk in high-temperature hydraulic circuits.

  • Advanced Additive Protection - Incorporates anti-erosion and acid-scavenger chemistry to protect system components from corrosion, wear, and acid-induced damage over extended service intervals.

  • Low Mist and Skin Irritation - Engineered to minimize aerosol formation and skin irritation, enhancing workshop safety and personnel comfort during fluid handling.

  • Easy Leak Identification - Vivid purple hue provides rapid visual detection of system leaks and simplifies maintenance inspections.


  • Environmental control system actuators and flight-control surface servos.

  • On-ground hydraulic test stands and workshop equipment requiring fire-resistant fluid.

  • Auxiliary power unit (APU) hydraulic circuits in transport-category aircraft.

  • Retrofits on legacy fleets and as an approved alternative to earlier phosphate-ester formulations.


  • What makes Skydrol 500B-4 fire-resistant?

Its phosphate-ester base inherently resists ignition and flame propagation, offering superior fire protection compared to mineral-based fluids.

  • Is Skydrol 500B-4 compatible with aircraft seals and materials?

Yes, it is approved for use with standard aviation elastomers, metals, and coatings when properly flushed during fluid changeovers.

  • How often should hydraulic systems be serviced with Skydrol 500B-4?

Follow the aircraft manufacturer’s maintenance schedule; typical hydraulic fluid change intervals range from 2,000 to 4,000 flight hours, subject to contamination and system testing results.


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