SKYDROL LD-4, Fire Resistant Hydraulic Fluid 946ml


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Out of stock



  • Aviation hydraulic systems

LD-4 Overview

Skydrol LD-4 was introduced in 1977 and also it 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. Because of 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 also deposit control.


Meets or Exceeds these Airframe Specifications

  • 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
  • Lastly, Bombardier BAMS 564-003

SKYDROL LD-4 Specifications

  • Appearance: Clear, purple liquid
  • Neutralization number: 0.10 max
  • Moisture content (wt.%): 0.20 max
  • Finally, Specific gravity, 77°F/77°F: 1.003-1.013

Viscosity in cSt

  • at 210°F/99°C: 3.66-4.00
  • at -65°F/-54°C: 2000 max.
  • Flashpoint, COC, min.: 320°F/160°C
  • Refractive Index @ 25°C: 1.443 to 1.451
  • at 100°F/38°C: 10.65-11.65
  • Lastly, Cleanliness Level: NAS 1638 Class 7 or better

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