Can National VI urea solution be used at temperatures below -30 degrees Celsius?

[LaJasmine]

National VI urea solution cannot be used at temperatures below -30 degrees Celsius. Freezing point temperature: The freezing point temperature of standard vehicle urea solution is -11 degrees Celsius. Vehicle urea solution begins to freeze at -11 degrees Celsius, and in practical use, it completely solidifies at -20 degrees Celsius. Current technology involves adding modifiers to lower the solution's freezing point and external heating devices to prevent solidification. Vehicle urea: Vehicle urea is an essential product for heavy-duty diesel vehicles to meet the National IV emission standards. Vehicle urea refers to a urea aqueous solution with a urea concentration of 32.5% and a solvent of ultra-pure water, with raw materials being specialized vehicle urea and ultra-pure water.