Is 32% Concentration AdBlue Compliant for China VI Vehicles?

[Santana]

China VI compliant AdBlue has a 32% concentration. The China VI engine standard specifies the concentration of AdBlue solution at 32.5%. At this concentration, the freezing point of the AdBlue solution is -11°C. In the aftertreatment system, the concentration of the urea solution is one of the critical factors. Concentrations that are too high or too low not only fail to improve NOx conversion efficiency but can also lead to ammonia slip (ammonia leakage due to an excessively high NH3/NOx ratio), resulting in secondary pollution from ammonia gas. Below is an introduction to AdBlue: 1. Origin: AdBlue solution was first used in Europe, where it is called AdBlue. In North America, it is referred to as DEF (Diesel Exhaust Fluid), while in China, it is known as AdBlue solution or "vehicle denitrification agent." However, it is now generally referred to as "AdBlue" in China. 2. Function: AdBlue solution is key to reducing pollutant emissions from diesel vehicles. AdBlue solution is a urea-based chemical reactant, composed of high-purity urea and deionized water, forming a solution with a concentration of 32.5%. The application of AdBlue solution in the SCR system is crucial for engine exhaust emissions to meet China IV and higher emission standards.