New Higher Ratio Set for Ultra AdBlue ?

In order to combat the ultra low limits for NOx as defined within the USA’s impending EPA2010 legislation, a Urea solution with a higher concentration is currently being tested.

Various US based offices of Volvo and Mercedes are running trials with the new mixture which incorporates a 40:60 ratio of Urea to De-ionised water

It is believed that the 40% Urea solution (which is 25% higher than the European standard for AdBlue) is needed to ensure that the SCR remains efficient whilst reaching the 0.27g/kWh as specified within the forthcoming stateside environmental legislation.

With limits for Euro V coming under review, it has been speculated that a new Ultra-AdBlue Solution may be required in the near future leading to a new ISO set of standards.