Product Overview
Skydrol LD-4 was introduced in 1977 , and is well known around the world. At the time of its introduction it was a breakthrough product, solving problems of valve erosion and thermal stability common in earlier fluids. Its excellent thermal stability under real world conditions has given it a reputation as the gold standard among Type IV fluids. Skydrol LD-4 features low density, excellent thermal stability, valve erosion prevention, and deposit control. Fluids ApplicationsAviation hydraulic fluidFire Resistant Hydraulic FluidTypical PropertiesPropertyTest MethodTypical Value, UnitsGeneralAcid Number (mg KOH/g) 0.10 MaximumAppearance Clear, oily liquidAutoignition TemperatureASTM D 2155400 °C (752 °F ) MinimumColor Purple, essentially equivalent to intensity and hue standardElemental Content Calcium 10 ppm, Maximum Chlorine 50 ppm, Maximum Potassium 30 ppm, Maximum Sodium 10 ppm, Maximum Sulfur 1185-1540 ppmFire Point COC 177 °C (350 °F ) MinimumFlash Point COC 160 °C (320 °F ) MinimumMoisture 0.20 % MaximumParticle Contaminationa 15-25 micron size 5,700 Maximum 25-50 micron size 1,012 Maximum 50-100 micron size 180 Maximum 5-15 micron size 32,000 Maximum Over 100 micron size 32 MaximumPour Point -62 °C (-80 °F ) MaximumSpecific Gravity @ 25°C/25°C 1.003-1.013Viscosity @ 38°C (100°F) 10.65-11.65 cSt @ -54°C (-65°F) 2000 cSt Maximum @ 99°C (210°F) 3.66-4.00 cSt Eastman Chemical Eastman Chemical Industrial Chemicals,Fluids and Lubricants Aviation
Typical Technical Properties
Product-specific technical values. Confirm current specifications with the supplier before commercial use.
| Property | Typical value | Condition | Test method / source |
|---|---|---|---|
| Property | Test Method | Typical Value, Units | |
| Autoignition Temperature | ASTM D 2155 | 400 °C (752 °F ) Minimum |
Product Identity
| Chemical name | Fluids |
|---|
Applications
Application areas documented for this product grade.
Processing & Availability
- Additional product information
- General
- Additional product information
- Acid Number (mg KOH/g) | | 0.10 Maximum
- Additional product information
- Appearance | | Clear, oily liquid
- Additional product information
- Color | | Purple, essentially equivalent to intensity and hue standard
- Additional product information
- Elemental Content
- Additional product information
- Calcium | | 10 ppm, Maximum
- Additional product information
- Chlorine | | 50 ppm, Maximum
- Additional product information
- Potassium | | 30 ppm, Maximum
- Additional product information
- Sodium | | 10 ppm, Maximum
- Additional product information
- Sulfur | | 1185-1540 ppm
- Additional product information
- Fire Point
- Additional product information
- COC | | 177 °C (350 °F ) Minimum
- Additional product information
- Flash Point
- Additional product information
- COC | | 160 °C (320 °F ) Minimum
- Additional product information
- Moisture | | 0.20 % Maximum
- Additional product information
- Particle Contaminationa
- Additional product information
- 15-25 micron size | | 5,700 Maximum
- Additional product information
- 25-50 micron size | | 1,012 Maximum
- Additional product information
- 50-100 micron size | | 180 Maximum
- Additional product information
- 5-15 micron size | | 32,000 Maximum
- Additional product information
- Over 100 micron size | | 32 Maximum
- Additional product information
- Pour Point | | -62 °C (-80 °F ) Maximum
- Additional product information
- Specific Gravity
- Additional product information
- @ 25°C/25°C | | 1.003-1.013
- Additional product information
- Viscosity
- Additional product information
- @ 38°C (100°F) | | 10.65-11.65 cSt
- Additional product information
- @ -54°C (-65°F) | | 2000 cSt Maximum
- Additional product information
- @ 99°C (210°F) | | 3.66-4.00 cSt |
Technical Documents & Source References
No technical PDF is referenced in the source record for this product.