Eastman Skydrol 500B-4

Eastman SKYDROL  500B-4航空液压油是一种磷酸酯质IV型阻燃液压油，应用于各种飞机以及电厂伺服液压控制系统。上百万小时的飞行时间显示其完美的润滑性能。 四球磨损测试效果优良.       500B-4航空液压油是最先进的航空液压油之一，采用最专业的硫化酯科技。LD系列抗燃液压油包括Skydrol 500B-4,Skydrol LD-4和我们最新开发的Skydrol 5。

Skydrol 5是为当前最新近的航空机型设计的，它能提供更高的热稳定性，低密度，抗腐蚀，提高油漆相容性和最新的库存能让工作更加友好。  

500B-4航空液压油优势：  LD-4具有高热稳定性，氧化稳定性好，防腐性，与其他材料兼容性好，增强组件的可靠性。   

500B-4航空液压油应用：  广泛应用于飞机液压系统，适用于波音，空客，麦道等机型,以及伺服液压控制系统。   
 

500B-4航空液压油典型数据：  
 比重 0.998-1.003
38℃运动粘度 10.65-11.65 cst
99℃运动粘度 3.66-4.0       cst
-54℃运动粘度2000max                                                                                                                                                                                                                                                        
倾点 -62℃
闪点171

Aircraft Hydraulics –
Historical Perspective
Brief History of Aircraft Hydraulics

Early aviation hydraulic systems were used
to apply brake pressure. These systems
used a vegetable oil-based hydraulic fluid.
As aircraft design produced larger and faster
aircraft, greater use of hydraulics was neces-
sary. These advances led to development
of petroleum-based hydraulic fluids such
as Mil-O-3580 and, later, Mil-H-5606.
Shortly after World War II, the growing
number of aircraft hydraulic fluid fires drew
the collective concern of the commercial
aviation industry and the public. In 1948,
Monsanto Company worked with Douglas
Aircraft Company to develop a fire-resistant
hydraulic fluid based on phosphate ester
chemistry, which was named Skydrol
®7000.
As the transport industry moved toward
jets, Skydrol
®500A fluid was developed to
meet the environmental needs of the new air-
craft, and with the continuous development
of more advanced aircraft further modifica-
tions to Skydrol fluid formulations were made.
These changes, required by the aircraft man-
ufacturers, are known as modifications to the
fluid specification ... or simply as Type I, II,
III and now Type IV fluids.
Skydrol
®LD-4 and Skydrol
®500B-4
hydraulic fluids are Type IV fluids formulated
to exceed the rigid specifications of the aircraft
manufacturers. They have been in commercial
usage since 1978 and have demonstrated
outstanding performance.
In 1997, Solutia Inc. was formed from
the chemical businesses of Monsanto. Solutia
continues as the world leader in aviation
hydraulic fluid service and support.

Specifications and
Properties of Skydrol Fluids

Skydrol fluids are approved by all
airframe manufacturers specifying
phosphate ester hydraulic fluids including:
• Airbus Industrie
NSA307110
• Boeing Commercial Airplane Co.
BMS3-11
• McDonnell Douglas Corp.
DMS2014
• Lockheed Aircraft Corp.
LAC C-34-1224
• Society of Automotive Engineers
AS1241
• British Aerospace
BAC M.333.B
• Fokker
• Embraer
• Bombardier
BAMS 564-003
Many business aircraft manufacturers
utilize one or more of these material specifi-
cations. Business aircraft manufacturers that
have designed aircraft models for use with
phosphate ester fluids include:
• Westwind
• Cessna
• Gulfstream

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