Sulutia Skydrol LD-4 Fire-resistant phosphate ester hydraulic fluid

Aviation hydraulic fluid.

Specifications Skydrol LD-4.

Skydrol LD-4 is a low-density, fire-resistant hydraulic fluid primarily used in commercial aircraft engine systems. This aviation hydraulic oil has excellent lubricating properties, erosion resistance, and high-thermal stability. This tributyl-phosphate-based hydraulic oil also has improved component compatibility and reliability.

Due to its longer service life, Skydrol LD-4 helps reduce aircraft maintenance expenses and fuel usage while at the same time also meets the parameters set by major aircraft manufacturers. This aircraft hydraulic fluid is compatible with several materials like aluminum, and most elastomers and thermoplastics.

Buy and price.

Skydrol LD-4 is available here at Trast Aero! We have a reliable logistics system that secures the delivery of your orders. We are a top distributor of high-class aviation engine oils and greases and we ship worldwide. We have professional staffs to provide you with the detailed information and the technical specifications of our products.

Skydrol LD-4 datasheet.

Skydrol LD-4 hydraulic fluid is a Type IV fluid formulated to exceed the rigid specifications of the aircraft manufacturers. They have been in commercial usage since 1978 and have demonstrated outstanding performance.
Skydrol fluids are approved by all airframe manufacturers specifying phosphate ester hydraulic fluids, including the following material specifications:

Property	Test Method	Typical Value, Units
Acid Number (mg KOH/g)		0.10 Maximum
Appearance		Clear, oily liquid
Autoignition Temperature	ASTM D 2155	400 °C (752 °F ) Minimum
Color		Purple, essentially equivalent to intensity and hue standard
Elemental Content
Calcium		10 ppm, Maximum
Chlorine		50 ppm, Maximum
Potassium		30 ppm, Maximum
Sodium		10 ppm, Maximum
Sulfur		1185-1540 ppm
Fire Point COC		177 °C (350 °F ) Minimum
Flash Point COC		160 °C (320 °F ) Minimum
Moisture		0.20% Maximum
Particle Contamination a
5-15 micron size		32,000 Maximum
15-25 micron size		5,700 Maximum
25-50 micron size		1,012 Maximum
50-100 micron size		180 Maximum
Over 100 micron size		32 Maximum
Pour Point		-62 °C (-80 °F ) Maximum
Specific Gravity @ 25°C/25°C		1.003-1.013
Viscosity
@ 99°C (210°F)		3.66-4.00 cSt
@ 38°C (100°F)		10.65-11.65 cSt
@ -54°C (-65°F)		2000 cSt Maximum
a NAS 1638 particle counts per AS4059F