Description

Skydrol500B-4 is a high-performance, phosphate ester-based aviation hydraulic fluid. This specialized formulation is engineered to deliver exceptional fire resistance and reliable operation under the extreme conditions encountered in modern aircraft systems. It is a critical component for ensuring the safety and performance of commercial and military aviation fleets worldwide. Key industries requiring this product include aerospace manufacturing, airline maintenance operations, and military logistics.

Application

Skydrol500B-4 is specifically designed for demanding aviation hydraulic systems. Its primary and related applications include:

• Primary hydraulic fluid in commercial aircraft landing gear, flight control, and brake systems.
• Fire-resistant hydraulic medium for military aircraft where operational safety is paramount.
• Use in ground support equipment and hydraulic test stands within airline maintenance facilities.
• Servicing and topping off hydraulic systems in accordance with aircraft manufacturer specifications (e.g., Airbus, Boeing).
• Applications requiring a fluid with excellent thermal stability and hydrolytic stability.
• Systems operating across a wide temperature range, from ground operations to high-altitude flight.

Basic Information

Product Name	Skydrol500B-4
CAS No.	50815-84-4
Molecular Formula	Contact for details
Molecular Weight	Contact for details
Synonyms	Skydrol 500B-4; Aviation Hydraulic Fluid 500B-4; Phosphate Ester Hydraulic Fluid; Fire-Resistant Hydraulic Fluid Skydrol; SAE AS1241 Fluid; Boeing BMS 3-11 Type IV Fluid; Butylated Triphenyl Phosphate-based Fluid; Tetraalkyl Benzenesulfonamide (component)
EINECS	Contact for details

Quality Control

Our Skydrol500B-4 is manufactured and tested to meet or exceed stringent aerospace industry specifications, including SAE AS1241 and major OEM standards. Every batch undergoes rigorous quality testing to ensure compliance with critical parameters for viscosity, fire resistance, corrosion protection, and thermal stability. Certificates of Analysis (COA) are available upon request to provide full traceability and batch-specific data.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from heat sources and incompatible materials such as strong acids and organic solvents. The product is easily oxidized; containers should be kept tightly sealed to minimize exposure to air. Recommended storage temperature is between 15°C and 25°C (59°F and 77°F). Keep away from open flames and ignition sources.

Specification

Item	Specification
Appearance	Clear, light amber liquid
Identification (IR)	Conforms to standard
Density @ 15.6°C (60°F)	1.060 - 1.080 g/mL
Kinematic Viscosity @ -54°C	Max 3000 cSt
Kinematic Viscosity @ 100°C	Min 4.5 cSt
Flash Point (COC)	Min 200°C
Autoignition Temperature	Min 450°C
Acidity (as H3PO4)	Max 0.10 mg KOH/g
Water Content (Karl Fischer)	Max 0.10 %
Corrosion (Steel, 7 days @ 100°C)	Pass
Foaming Tendency	Pass

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.