Urea, also known as carbamide, is an organic compound with chemical formula CO(NH2)2. This amide has two –NH2 groups joined by a carbonyl (C=O) functional group.

Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals. It is a colourless, odourless solid, highly soluble in water, and practically non-toxic (LD50 is 15 g/kg for rats).[5] Dissolved in water, it is neither acidic nor alkaline. The body uses it in many processes, most notably nitrogen excretion. The liver forms it by combining two ammonia molecules (NH3) with a carbon dioxide (CO2) molecule in the urea cycle. Urea is widely used in fertilizers as a source of nitrogen (N) and is an important raw material for the chemical industry. 

Applications include

• Urea Concentration, Diesel Exhaust Fluid , DEF, AdBlue

AdBlue® is an aqueous solution with a concentration of 32.5 % urea. In North America, it is referred to as DEF (for "diesel exhaust fluid"). Urea reacts with nitrogen oxides and creates environmentally safe nitrogen and water. AdBlue® is therefore added to diesel to lower nitrogen oxide emissions. In countries where taxes are graduated according to vehicle emissions, reduced emissions of nitrous oxides may be cost efficient. Moreover, the addition of AdBlue® results in a reduction of fuel consumption by 3 % to 8 %.