Diesel engines — NOx reduction agent AUS 32 — Part 1: Quality requirements

ISO PAS 22241-1:2005 specifies the quality characteristics of the NOx reduction agent AUS 32 (aqueous urea solution) which is needed to operate converters with selective catalytic reduction, so-called SCR (Selective Catalytic Reduction) converters, in motor vehicles with Diesel engines. SCR converters are particularly suitable for selectively reducing the nitrogen oxide (NO_x) emissions of Diesel engines.

In the remaining parts of this ISO 22241, the term "NOx reduction agent AUS 32" will be abbreviated to "AUS 32".