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Diesel Exhaust Fluid (DEF), is a high-purity aqueous urea solution specifically manufactured for use in Selective Catalytic Reduction (SCR) systems fitted to modern diesel engines.
DEF consists of 32.5% high-purity automotive-grade urea and 67.5% demineralized water. When injected into the hot exhaust stream, it helps the SCR system convert harmful nitrogen oxides (NOx) into primarily nitrogen and water.
DEF is not a diesel fuel additive and must never be added directly to the diesel fuel tank. It is stored in a separate DEF tank and automatically metered into the exhaust system.
Urea Solution 32.5% is a clear, homogeneous aqueous solution containing approximately 32.5% by weight urea dissolved in water. It provides a convenient liquid source of urea for industrial applications where accurate dosing, rapid mixing and elimination of solid-urea handling are desirable.
The product can be used in industrial chemical processing, NOx-control systems, process-water applications and other formulations requiring a controlled concentration of urea.
Chemical Name: Urea
Formula: CH₄N₂O
CAS No.: 57-13-6
Concentration: 32.5% w/w Urea
DEF should not be manufactured using ordinary fertilizer-grade urea simply because it has the same chemical name.
SCR systems contain sensitive dosing equipment and catalysts, so impurities such as calcium, magnesium, sodium, potassium, iron, copper, phosphate and other contaminants must be tightly controlled.
For a product marketed as automotive DEF/AUS 32, both the raw materials and finished product should comply with the relevant requirements of ISO 22241.
Urea Solution 32.5% may be used for:
Urea solutions can be used as a reagent in appropriately designed industrial NOx-control systems. Under controlled operating conditions, urea ultimately provides ammonia species that react with nitrogen oxides to form primarily nitrogen and water.
The correct concentration, injection rate, temperature window and atomization conditions depend on the specific SCR/SNCR system and equipment design.
Important: 32.5% urea solution should not be represented as AdBlue/DEF/AUS 32. Automotive DEF is a standardized 32.5% high-purity urea solution, whereas this product contains approximately 32.5% urea.
These are not interchangeable products.
| Product | Urea Concentration | Primary Application |
|---|---|---|
| Diesel Exhaust Fluid / AUS 32 | 32.5% | Automotive/engine SCR systems |
| Urea Solution 40% | 40% | Industrial processes and appropriately designed NOx-control systems |
A 40% industrial urea solution should not be filled into a vehicle's DEF tank unless the equipment manufacturer explicitly specifies that concentration.
Store in a clean, closed and compatible tank or container and protect from contamination and excessive temperature. Because concentrated urea solutions can crystallize at sufficiently low temperatures, storage and transfer conditions should be selected to keep the product fully liquid.
For emission-control applications, contamination by metals, oils, salts or other chemicals should be carefully avoided where reagent purity is critical.
Urea 40 Percent solution is used as Selective Supplement for Urea Agar Base Christensen or Urea broth Base. Bacterial decomposition of urea has been especially useful in distinguishing between members of Proteus group and other organisms.
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