Overview
High transparency liquid urea is a purified aqueous solution containing 32.5% urea by weight, meeting strict quality standards for various industrial applications. Originally developed for automotive Selective Catalytic Reduction (SCR) systems to reduce NOx emissions, it has gained importance in agriculture as a precision fertilizer and in chemical manufacturing processes. The solution's high transparency indicates superior purity, typically with aldehyde content below 0.5 ppm and biuret content under 0.3%. These specifications make it particularly valuable for sensitive applications where impurities could cause system fouling or unwanted chemical reactions.
Physical and Chemical Properties
The solution maintains excellent stability between -11°C to 50°C, with additives often included to prevent crystallization in cold weather. Its refractive index (approximately 1.381) and density make it easy to monitor quality through simple optical measurements. Chemically, the solution is non-flammable with a pH around 9-10. It decomposes when heated above 60°C, releasing ammonia gas. The urea content is precisely controlled to 32.5% as this concentration provides the optimal freeze point depression while maintaining effective NOx reduction performance in SCR systems.
Main Applications
In automotive applications, known as Diesel Exhaust Fluid (DEF) or AdBlue, it's injected into the exhaust stream of diesel vehicles to break down harmful NOx emissions into nitrogen and water. The global adoption of Euro 6 and similar emission standards has created massive demand in this sector. Agricultural uses include foliar fertilization and fertigation systems, where its high solubility and purity prevent nozzle clogging. Industrial applications range from denitrification processes in power plants to use as a reducing agent in chemical synthesis and as a raw material for urea-formaldehyde resins.
Safety and Storage
While not classified as hazardous, the solution can cause mild skin or eye irritation. Storage tanks should be made of stainless steel or specially coated carbon steel to prevent contamination. Polyethylene containers are acceptable for smaller quantities. Proper ventilation is essential in storage areas to prevent ammonia buildup from potential decomposition. Bulk storage systems should include temperature monitoring and agitation systems to maintain homogeneity. Shelf life is typically 6-12 months depending on storage conditions.
B2B Procurement Guide
Industrial buyers should specify the intended application when procuring, as different standards apply (e.g., ISO 22241 for automotive use versus fertilizer grades). Key purchasing considerations include batch certification, packaging options (IBCs, bulk, or drums), and regional availability. Quality verification should include testing for conductivity, refractive index, and aldehyde content. For large-volume purchases, consider suppliers with dedicated transportation and storage infrastructure to maintain product integrity. Price fluctuations often correlate with agricultural urea market trends.
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