What is the formula for automotive urea?

[JoannaLynn]

It is composed of 32.5% high-purity urea and 67.5% deionized water. Below is a related introduction to automotive urea: 1. Usage instructions: Automotive urea must use ultra-pure water of electronic grade. Since the SCR catalyst carrier is highly susceptible to metal ion poisoning, which can lead to loss of catalytic effect, automotive urea solution must use ultra-pure water of electronic grade (resistivity ≥18MΩ?cm). Automotive urea solution begins to freeze at -11°C, and in practical use, it completely freezes at -20°C. Current technology involves adding modifiers to lower the solution's freezing point and external heating devices to prevent the solution from freezing. 2. Advantages of automotive urea solution: Automotive urea solution is prepared by mixing high-purity urea without any additives with pure water, with a urea content of 32.5% (by mass fraction). Most domestic and international heavy-duty diesel engine manufacturers have adopted SCR (Selective Catalytic Reduction) technology to meet the requirements of Euro IV and Euro V vehicle emission standards. Vehicles using SCR technology must add urea solution as a catalytic reductant to meet emission standards.