2010 Bus Emissions

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2010 EMISSIONS
Did you know facts about UREA?

Subject: UREA by Many or Any other name is still UREA

You may hear different names for urea, like DEF [Diesel Exhaust Fluid] or in Europe “AdBlue®??. The fact is the real name of the mixture is an aqueous urea solution. This is an ammonia based product with very unique properties that the proponents of SCR do not speak of publicly. It is important that you have the facts to share with your customers.

Let’s examine those very unique characteristics of urea, as it relates to temperature.

1. While urea is used in many different industrial and agricultural applications, the grade used to reduce NOx in commercial vehicle applications must have a consistent high purity level and a precise concentration of 32.5% urea and 67.5% de-mineralized water.

2. Urea is corrosive to aluminum and must be stored in plastic or stainless steel tanks. Don’t spill it on any aluminum components.

3. Urea is very sensitive to temperature. At 86° F, it begins to deteriorate and at 12° F, urea begins to crystallize.

	When ammonia [urea is an ammonia based product] goes above 86° F, it separates and evaporates. That reaction influences the quality and purity of the solution.
	At 12° F or less, freezing takes place requiring a heating system to assure vehicle operation and product storage.

4. At normal temperatures, urea is a non-hazardous solution, however, when it reaches 130° F, it becomes hazardous and begins to decompose.

The temperature characteristics of urea will have significant implications for bulk storage and transport of the solution in the United States. Bulk deliveries for fleets also may require heated storage facilities in the North and cooled facilities in the South and West.

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For More Information Please Visit the Navistar 2010 Emissions Website or the Maxxforce Engine Website.

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