What Is AUS 40?

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What is AUS 40?

2020-12-31

What is AUS 40?

Aqueous urea solution AUS 40 reduces nitrogen oxide emission from vessel or diesel engine exhaust system. The solution is injected to diesel engine exhaust system before selective reduction catalyst, consequently due to the solution reaction with nitrogen oxide gasses emissions are converted to water vapour and nitrogen.

The quality requirement must be compiled with ISO 18611- Marine NOx Reduction Agent AUS 40:

Parameters	Values	Unit
Urea Content	39.0 – 41.0	% (m/m)
Density at 20 oC	1105 – 1177	kg/m3
Refractive Index at 20	1.3947 – 1.3982
Alkalinity as NH3	< 0.5	% (m/m)
Biuret	< 0.8	mg/kg
Aldehydes	< 100	mg/kg
Insoluble Matter	< 50	mg/kg
Phosphate(PO4)	< 1.0	mg/kg
Calcium	< 1.0	mg/kg
Iron	< 1.0	mg/kg
Magnesium	< 1.0	mg/kg
Sodium	< 1.0	mg/kg
Potassium	< 1.0	mg/kg