Ultra Pure™ Hydrazine

Hydrazine (N2H4) is a clear, colorless, hygroscopic liquid with a distinct, ammonia-like odor. It is a highly polar solvent, miscible with other polar solvents but immiscible with non-polar solvents.

The purity of Ultra Pure™ anhydrous hydrazine exceeds the requirements for both the Monopropellant Grade and High Purity Grade set forth in Military Specification MIL-P-26536D (July 27, 1987). Ultra Pure™ hydrazine is aniline-free. No aniline is detectable at the detection limit of specified analysis procedures.

Specifications for Monopropellant Grade, High Purity Grade and Ultra Pure™ hydrazine are given in Table 1 below. Physical properties of Ultra Pure™ hydrazine are given in Table 2 below. Many of these properties are similar to those of water.

Anhydrous hydrazine is a strong reducing agent. Mixtures of hydrazine and very strong oxidizers are hypergolic (i.e., they auto-ignite on contact). Hydrazine and hydrazine blends are used as fuels in hypergolic bipropellant combinations. They also have other properties, such as high specific impulse. Anhydrous hydrazine in contact with platinum group metal catalysts will decompose in a controlled reaction and can be used as a monopropellant.

Ultra Pure™ hydrazine is very hygroscopic. It also readily absorbs carbon dioxide from the air. These two properties are of special concern during handling.

Table 1
Ultra Pure™ Specifications
ComponentGrade
(% by Weight)MonopropellantaHigh PurityaUltra Pure™
Hydrazine, min98.59999.5
Water, max1.01.00.5
Particulate, max1.0b1.0b1.0b
Ammonia 0.30.3c
Aniline, max0.50.003Freed
Cabon Dioxide, max0.0030.0030.003
Chloride, max0.00050.00050.0005
Iron, max0.00040.00040.0004
Nonvolatile residue, max0.0050.0010.001
Other volatile carbonaceous materiale, max0.020.0050.005
aMilitary Specification MIL-PRF-26536G (July 11, 2017)
bmg/L
cMax
dNot detectable at detection limits of all specified methods
eTotal as unsymmetrical dimethyl hydrazine (UMDH), monomethyl hydrazine (MMH) and alcohol


Physical properties of anhydrous hydrazine are given in Table 2 below. Many of these properties are similar to those of water. In addition, anhydrous hydrazine is a strong reducing agent. Mixtures of hydrazine and a very strong oxidizers are hypergolic. They also have other properties, such as high specific impulse, which makes them valuable as aerospace fuels.

Table 2
Typical Physical Properties
pH<1%>10.1-10.7
Density@ 25°C (g/mL)1.004
@ 25°F (lb/gal)8.379
Viscosity@ 25°C (cp)0.90
Vapor Pressuremm Hg @ 30.7°C10
Boiling Point@ 760 mm Hg (°C)113.5
@ 760 mm Hg (°F)236.3
Freezing Point(°C)2.0
(°F)35.6
Flash PointTCC (°C)37.8
TCC (°F)100.0
Flamable Limits in Air(% by vol)4.7-100

For more information on Ultra Pure™ hydrazine or our other propellants products, please contact us.