DEF standardized as AUS 32 in ISO 22241. VDA registered the trademark AdBlue for AUS 32

ABI Blue, used in the exhaust stream of diesel vehicles, breaks down harmful Nitrogen Oxide emissions into Nitrogen
(which makes up 78% of the air we breathe), and water.

Stage 1

ABI Blue is sprayed on the exhaust stream of a diesel engine which mixes with the toxic exhaust gases and then it flows into the SCR unit.

Stage 2

This starts off a chemical reaction which treats the polluting elements of the exhaust gas, and converts them into Nitrogen, Carbon dioxide and water. This process is known as Selective Catalytic Reduction, or SCR, and is only used in diesel engines.

Stage 3

Tiny amounts of ABI Blue are injected into the flow of exhaust gases. At high temperatures ABI Blue turns to ammonia and carbon dioxide.

Stage 4

Inside the SCR catalyst, harmful nitrogen oxide in the exhaust reacts with the ammonia and is transformed to harmless nitrogen and water.

Note: DEF does not come in contact with diesel, it is placed in a separate tank in diesel vehicles.