AUS32 Automotive Grade Urea Product Introduction
I. Product Definition and Name
AUS32 is the abbreviation of Aqueous Urea Solution 32%, with the Chinese full name of automotive urea solution and a concentration of 32.5%. It is also known as AdBlue® (a trade name widely used in Europe, Africa, Asia and other regions), DEF (Diesel Exhaust Fluid) in the United States and other regions, or ARLA 32 in Brazil. It is a non-hazardous, non-toxic, colorless and transparent liquid made by mixing high-purity urea and deionized water.
II. Core Components and Standards
Components: Composed of 32.5% high-purity urea and 67.5% deionized water.Standards: Must strictly comply with the international standard ISO 22241 (the corresponding standard in China is GB 29518-2013). This standard sets extremely strict limits on urea purity, biuret, phosphate, aldehydes, metal ions (such as calcium, magnesium, iron, copper, zinc, chromium, etc.) and insoluble matter content to ensure the long-term stable operation of the SCR system and prevent catalyst poisoning and nozzle clogging.
III. Action Mechanism and Core Applications
This product is a consumable specially used for diesel engine vehicles equipped with a Selective Catalytic Reduction (SCR) system. Its main function is to convert harmful nitrogen oxides (NOx) in exhaust gas into harmless nitrogen and water vapor through chemical reactions.Working Principle: After the exhaust gas is discharged from the engine, AUS32 is precisely injected into the exhaust pipe. At high temperatures, urea is hydrolyzed to produce ammonia (NH₃), which reduces nitrogen oxides to harmless nitrogen (N₂) and water (H₂O) in the SCR catalyst.Core Applications:
Heavy-duty diesel vehicles: Trucks, passenger cars, buses, etc.
Off-road machinery: Tractors, harvesters, engineering machinery, generators, etc.
Ships: Diesel-powered ships equipped with SCR systems.
Meet National IV/V/VI and higher emission standards: It is an essential consumable for diesel vehicles to achieve low emissions and meet environmental regulatory requirements.
IV. Key Quality Indicators
Urea content: Strictly controlled between 31.8% - 33.2%.Density: About 1.087 - 1.093 g/cm³ (20°C).Biuret: Extremely low content (≤0.3%), excessive content will cause nozzle clogging.Insoluble matter: ≤20 mg/kg to ensure the solution is clear and free of impurities.Metal ions: The contents of calcium, magnesium, iron, copper, zinc, chromium and other metal ions are strictly controlled at the ppm (parts per million) level to prevent catalyst poisoning.Aldehydes: Extremely low content calculated as formaldehyde.
V. Packaging, Storage and Usage
Packaging Forms:
Small packaging: 10L, 20L plastic barrels, convenient for individual car owners and small fleets.
Medium packaging: 200L, 1000L IBC ton barrels, suitable for logistics fleets, gas stations and maintenance points.
Bulk: Directly filled into the storage tanks of large fleets or gas stations through tank trucks, and then sold through filling machines.
Storage Requirements:
Light protection: Should be stored indoors or in a cool place to avoid direct sunlight.
Temperature: The optimal storage temperature is -5°C to 25°C. Low temperatures may cause crystallization (freezing point about -11°C), and the quality remains unchanged after heating and melting; high temperatures will cause urea decomposition and shorten the shelf life.
Shelf life: Under recommended conditions, the shelf life is usually 12-18 months.
Cleanliness: Storage containers must be special and clean, and any contamination may damage the SCR system.
Usage Notes:
A special filling gun or clean funnel must be used for filling to prevent impurities from entering.
If it splashes on the skin or clothing, rinse with clean water immediately.
It has slight corrosivity to some metals (such as copper and brass), and the filling system must use stainless steel or special plastic materials.
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