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Diesel Exhaust Fluid Urea Solution

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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

 
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