Technical Articles|Lvyan Chemical Editorial
How Biuret Content Affects SCR Nozzle Clogging — and How to Control It
Biuret is a key DEF indicator. Excess levels can crystallize and clog SCR injectors, reducing NOx conversion efficiency.
In an SCR selective catalytic reduction system, automotive urea decomposes at high temperature to produce ammonia, which reduces NOx in the exhaust. However, if biuret from the urea feedstock or process is too high, crystals can deposit in injectors and lines, causing uneven dosing, system alarms, or even torque limiting.
GB29518-2013 clearly requires biuret in automotive urea to be ≤0.3%. Lvyan Chemical uses quality industrial urea feedstock and strict process control so LV BAI JIA products keep biuret stably within specification.
Usage tips:
- Purchase compliant branded products that meet GB29518-2013
- Avoid direct sun and high-temperature storage; recommended range −5°C to 25°C
- Clean the SCR urea tank regularly to prevent contamination
- Service injectors promptly if abnormal; never use urea of unknown origin
