Car urea is an essential product for heavy-duty diesel vehicles to meet the National IV emission standards. Vehicle urea refers to an aqueous urea solution with a urea concentration of 32.5% and ultrapure water as the solvent. The raw materials are urea crystals and ultrapure water. For diesel vehicles such as heavy trucks and passenger cars to meet the National IV emission standards, a suitable SCR system must be selected for exhaust gas treatment, and this system must use urea solution to treat nitrogen oxides in the exhaust gas. Therefore, urea solution for vehicles has become an essential product for heavy-duty trucks and passenger cars to meet the National IV emission standards.

The vehicle urea solution (AdBlue) is a solution prepared with high-purity urea without any other additives and pure water. The urea content in the solution is 32.5% (mass fraction). Most domestic and foreign heavy-duty diesel engine manufacturers use SCR (Selective Catalytic Reduction) technology to meet the requirements of Euro IV and Euro V vehicle emission standards. Vehicles that choose SCR technology must add urea solution as a catalytic reductant to make the vehicle meet the emission standards.