Urea (Aqueous Urea Solution AUS 32, DEF)
The used reagent is a mixture of 32.5% solution of synthetic urea and demineralized water. It is used as
a reducing agent NOx for additional treatment of exhaust gases by SCR (selective catalytic reduction) of
motor vehicles with diesel engines.
The product is labelled as Urea or AUS 32 (AUS: Aqueous Urea Solution) and complies with the standard
ISO 22241-1 Reducing agents NOX AUS 32.
The urea solution AUS 32 is known in USA and North America as Diesel Exhaust Fluid (DEF).
The lifetime of urea without the loss of the quality is influenced by storage conditions.
It crystallizes at ambient temperature below -11°C and at ambient temperature over +35°C it initiates
hydrolytic reaction which means that a slow decomposition to ammonia and carbon dioxide begins.
It is essential to protect unprotected vessels from direct sunlight.
Barrels must not be stored longer than one year!
Pay attention to the resistance of the used materials and store vessels.
Urea freezes below the temperature of -11°C.
To ensure proper functioning of the SCR system, urea with the concentration of 32.5% must be
used!
Principles for safe handling of urea (AUS 32, DEF)
Contact with skin
- Prolonged or repeated contact may cause skin irritation.
Contact with eyes
- Prolonged or repeated contact may cause eye irritation. Rinse eyes with plenty of water for at least 15
minutes. If irritation persists, visit a physician.
Ingestion
- In case of ingestion of small quantities, toxic effects are not likely. Higher amount may cause intestinal or
stomach problems. Do not induce vomiting. Drink half a litre of water or milk. In case of ingestion of a larger
than small quantity, visit a physician.
Fire-fighting measures
- The product has fire extinguishing properties.
Extinguishing means
- If the material got in the fire, use large amount of water for extinguishing.
Accidental release measures
- Minimize contact of the spilled material with the soil so that you do not allow product to reach surface or
underground water courses.
- Soak u
the s
illed material with dr
soil, sand or other no
-flammable material
SYSTEM OF ADDITIONAL TREATMENT OF EXHAUST GASES
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