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UAN is a solution
Solution

In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is dissolved in another substance, known as a solvent....
 of urea
Urea

Urea is an organic compound with the chemical formula 2carbonoxygen.Urea is also known by the International Nonproprietary Name carbamide, as established by the World Health Organization....
 and ammonium nitrate
Ammonium nitrate

The chemical compound ammonium nitrate, the nitrate of ammonia with the chemical formula NitrogenHydrogen4NitrogenOxygen3, is a white powder at room temperature and standard pressure....
 in water used as a fertilizer. The combination of urea and ammonium nitrate has an extremely low critical relative humidity
Critical relative humidity

The critical relative humidity of a salt is defined as the relative humidity of the surrounding atmosphere at which the material begins to absorb moisture from the atmosphere and below which it will not absorb atmospheric moisture....
 (18% at 30°C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N), which consists of 45% ammonium nitrate
Ammonium nitrate

The chemical compound ammonium nitrate, the nitrate of ammonia with the chemical formula NitrogenHydrogen4NitrogenOxygen3, is a white powder at room temperature and standard pressure....
, 35% urea
Urea

Urea is an organic compound with the chemical formula 2carbonoxygen.Urea is also known by the International Nonproprietary Name carbamide, as established by the World Health Organization....
 and only 20% water. Other grades are UAN 28, UAN 30 and UAN 18.






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UAN is a solution
Solution

In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is dissolved in another substance, known as a solvent....
 of urea
Urea

Urea is an organic compound with the chemical formula 2carbonoxygen.Urea is also known by the International Nonproprietary Name carbamide, as established by the World Health Organization....
 and ammonium nitrate
Ammonium nitrate

The chemical compound ammonium nitrate, the nitrate of ammonia with the chemical formula NitrogenHydrogen4NitrogenOxygen3, is a white powder at room temperature and standard pressure....
 in water used as a fertilizer. The combination of urea and ammonium nitrate has an extremely low critical relative humidity
Critical relative humidity

The critical relative humidity of a salt is defined as the relative humidity of the surrounding atmosphere at which the material begins to absorb moisture from the atmosphere and below which it will not absorb atmospheric moisture....
 (18% at 30°C) and can therefore only be used in liquid fertilizers. The most commonly used grade of these fertilizer solutions is UAN 32.0.0 (32%N), which consists of 45% ammonium nitrate
Ammonium nitrate

The chemical compound ammonium nitrate, the nitrate of ammonia with the chemical formula NitrogenHydrogen4NitrogenOxygen3, is a white powder at room temperature and standard pressure....
, 35% urea
Urea

Urea is an organic compound with the chemical formula 2carbonoxygen.Urea is also known by the International Nonproprietary Name carbamide, as established by the World Health Organization....
 and only 20% water. Other grades are UAN 28, UAN 30 and UAN 18. The solutions are quite corrosive towards mild steel (up to 500 MPY on C1010 steel) and are therefore generally equipped with a corrosion inhibitor to protect tanks, pipelines, nozzles, etc.

Physical and Chemical Characteristics of Urea Ammonium Nitrate Solutions

The solutions contain a remarkably low amount of water and nevertheless have a low salt-out temperature:

 style="font-size: larger;" | Physical and Chemical Characteristics of UAN Solutions
Grade, %N: 28 30 32
Ammonium Nitrate (%): 40 42 45
Urea (%): 30 33 35
Water (%): 30 25 20
Specific Gravity at 16°C: 1.283 1.303 1.320
Salt-out Temperature (°C): -18 -10 -2