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AdBlue® information sheet
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9.8 AdBlue® information sheet
Identification
AdBlue is the trade name for the diesel engine NOx reduction agent AUS 32 defined
by the standard DIN 70070 / ISO 22241.
AdBlue functions
AdBlue reduces toxic nitrogen oxides to water vapour and elementary nitrogen in the
exhaust of diesel-powered vehicles with SCR catalytic converter technology.
Chemical characteristics and composition of AdBlue
AdBlue consists of technically pure urea, without addition of foreign substances, dis-
solved in demineralized water. It contains 32.5% of urea. AdBlue is not an additive but
is contained in a separate tank in vehicles SCR catalytic converter technology.
Chemical formula: H
2
N-CO-NH
2
Mol mas (urea): 60.06 g/mol
CAS (Chemical-Abstracts-Service)-No.: 57-13-6
Handling contaminated by AdBlue operating materials, fuels and lubricants
It should be ensured that AdBlue is strictly separated from other operating materials,
fuels and lubricants, e.g. coolant, engine oil, fuel, hydraulic and brake fluids, and not
the same containers and collecting tanks are used. For example, even minimal quan-
tity of AdBlue is enough in the coolant circuit to damage thermostats and temperature
sensors. Operating materials, which contain traces of AdBlue, must not be used.
Handling AdBlue contaminated by foreign substances
Some components of the exhaust gas treatment system react very sensitively to the
smallest traces of contamination in AdBlue. Therefore, when handling AdBlue, it is
always necessary to use only clean containers and collecting tanks dedicated to this
purpose. AdBlue that contain traces of impurities may not be used further.
Usage period and storage life
AdBlue decomposes during storage to ammonium hydroxide and carbon dioxide and
then no longer conforms to the requirements of DIN 70070 / ISO 22241. If the recom-
mended storage temperature of maximum 25°C is maintained, then AdBlue meets
the requirements of this norm for at least 6 months after its date of manufacture. If
the recommended storage temperature is exceeded, then this period is shortened.
AdBlue freezes and solidifies at temperatures below -11°C. If warmed, frozen AdBlue
will again liquefy and can be used again without degradation of quality.
Disposal and degradability
AdBlue only poses a low level of danger to water bodies and soil. It can be further
used by microbes and is therefore easily decomposed. For this reason, AdBlue is
classified in Germany in the lowest risk category of WGK 1 water hazards (German
Water Hazard Classification).
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