UDMH

UDMH or Unsymmetrical Dimethylhydrazine ((CH3)2NNH2) became the storable liquid fuel of choice by the mid-1950’s. Development of UDMH in the Soviet Union began in 1949. It is used in virtually all storable liquid rocket engines except for some orbital maneuvering engines in the United States, where MMH has been preferred due to a slightly higher density and performance.

Reference Points

UDMH == UnsymmetricDiMethylHydrazine

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Tref Pref SG Cp dHvap Visc Cond Surf
SourceRpsiag/mlBTU/lbm-RBTU/lbmpoiseBTU/hr-ft-Rlbf/in
RocketProps527.714.70.79040.665250.55.533e-030.09191.407e-04
AFRPL-TR-69-149536.414.70.78610.704233.54.920e-030.09091.375e-04
Aerojet527.714.70.79040.665250.65.534e-030.0919---
Vandenberg527.714.70.7913---245.9---0.0947---

Fluid Properties

UDMH == UnsymmetricDiMethylHydrazine

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MolWt Tc Pc SGc Zc Tnbp Tmelt omega
Sourceg/gmoleRpsiag/ml(-)RR(-)
RocketProps60.099941.7867.00.27670.2985603.9388.70.34992
AFRPL-TR-69-14960.102941.0867.00.27500.3006603.8388.7---
Aerojet60.099941.7867.00.27670.2985603.9388.70.36186
Vandenberg60.099941.4787.70.26100.2877606.7387.30.34300

Vapor Pressure



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Density



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Heat Capacity



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Viscosity



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Heat of Vaporization



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Thermal Conductivity



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Surface Tension



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