上海夏朝直播程序物资有限公司

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 specifications.
Business aircraft manufacturers that
have designed aircraft models for use with
phosphate ester fluids include:
• Westwind
• Cessna
• Gulfstream
Specifications and
Properties of Skydrol Fluids
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Specifications* forSpecifications* for Skydrol® Fluids
Property Skydrol® LD-4 Skydrol® 500B-4
Appearance Clear, purple liquid Clear, purple liquid
Neutralization number 0.10 max 0.10 max.
Moisture content (wt.%) 0.20 max 0.20 max
Specific gravity, 77 °F/77 °F 1.003-1.013 1.050-1.062
Viscosity in cSt
at 210 °F/99 °C 3.66-4.00 3.68-4.00
at 100 °F/38 °C 10.65-11.65 11.4-12.4
at -65 °F/-54 °C 2000 max. 4200 max.
Flash point, COC, min. 320 °F/160 °C 350 °F/177 °C
Refractive Index @ 25 °C 1.443 to 1.451 1.466 to 1.474
Cleanliness Level NAS 1638 Class 7 or better
*Specifications are subject to change. Write us for our latest specifications.
Typical Physical and Chemical Properties*
Property Skydrol® LD-4 Skydrol® 500B-4 Test Method
Viscosity in cSt
-65 °F/-54 °C 1185 cSt 2765 cSt
100 °F/38 °C 11.42 cSt 11.51 cSt ASTM D445
210 °F/99 °C 3.93 cSt 3.78 cSt
Pour Point
°F <-80 °F <-80 °F ASTM D97
°C <-62 °C <-62 °C
Specific Gravity, 25 °C/25 °C 1.009 1.057 Solutia 116-B
Density at 100 °F/37 °C, g/cm3
(See Pg. 6) 0.990 1.045
Coefficient of Expansion** 5.1x10-4/°F 4.7x10-4/°F
9.2x10-4/°C 8.5x10-4/°C
Weight, 75 °F/24 °C
lb/gal 8.41 8.82
kg/m3 1008 1,057
Moisture, % 0.15 0.15 ASTM D1744
Acidity (neutralization
number) 0.10 max 0.10 max ASTM D974
Bulk Modulus
psi 221,000 psi or 242,000 psi or As described in BMS3-11
15,237 x 105Pa 16,685 x 105Pa
Foam (ml foam/sec. collapse)
Sequence 1 75 °F/24 °C 50 cm3/25 s 100 cm3/35 s
Sequence 2 200 °F/93 °C 10 cm3/5 s 20 cm3/15 s ASTM D892-63
Sequence 3 75 °F/24 °C 40 cm3/20 s 110 cm3/40 s
Specific Heat
100 °F/38 °C 0.437 kcal/(kg. °C) 0.418 kcal/(kg. °C) Perkin-Elmer Differential
200 °F/93 °C 0.472 kcal/(kg. °C) 0.453 kcal/(kg. °C) Scanning Calorimeter
300 °F/149 °C 0.507 kcal/(kg. °C) 0.487 kcal/(kg. °C) Model DSC-1
Thermal Conductivity Btu/(h.ft.°F) kcal/(h.m.°C) Btu/(h.ft.°F) kcal/(h.m.°C)
100 °F/38 °C 0.0764 1.89 x10-3 0.0761 1.89 x10-3 Non-steady
200 °F/93 °C 0.0722 1.79 x10-3 0.0723 1.79 x10-3 Transient-Method
300 °F/149 °C 0.0670 1.66 x10-3 0.0672 1.67 x10-3 (Hot Wire)
Surface Tension, 77 °F/25 °C 28.2 dyn/cm 26.7 dyn/cm Du-Nouy Balance
Conductivity,
microsiemens/cm 0.43 0.41 Conductivity Bridge
Heat of Combustion 13,200 Btu/lb 13,000 Btu/lb ASTM D240
7.33 kcal/g 7.23 kcal/g
*These data are based upon samples tested in the laboratory and are not guaranteed for all samples.
**Calculated for 100-300 °F/37-149 °C range using C =
C=coefficient of expansion
V1=volume at temperature, T1
V2=volume at temperature, T2
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(V2 - V1)
V1 (T2 -T1)
Typical Fire Resistance Properties*
Property Skydrol® LD-4 Skydrol® 500B-4 Test Method
Flash Point 340 °F/171 °C 360 °F/182 °C ASTM D92
Fire Point 360 °F/182 °C 410 °F/210 °C ASTM D92
AIT 880 °F/471 °C 945 °F/507 °C ASTM D2155
Hot Manifold Drip
Manifold Temp. 1300 °F/704 °C 1300 °F/704 °C AMS 3150C
Results Equivalent to Std. Better than Std.
Hot Manifold Spray
Fluid Temp. 167 °F/75 °C 167 °F/75 °C
Manifold Temp. 1100 °F/593 °C 1200 °F/649 °C Solutia Modified
Fluid Pressure 1000 psi/68.9 bar 1000 psi/68.9 bar AMS 3150C
Results No flashing or burning No flashing or burning
High Pressure Spray Equivalent to Std. Better than Std. AMS 3150C
Low Pressure Spray Better than Std. Better than Std. AMS 3150C
Wick Flammability Equivalent to Std. Equivalent to Std. AMS 3150C
*These data are based upon samples tested in the laboratory and are not guaranteed for all samples.