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NW Washington | It is all supposed to meet the ISO standard, 32.5% urea and deionized water.
AI Overview
Top 10 Facts About Diesel Exhaust Fluid | Cars.com
DEF fluid, or diesel exhaust fluid, is a mixture of 32.5% synthetic urea and 67.5% high-purity deionized water. The urea is a nitrogen-based compound, and the deionized water is purified to remove minerals that could damage the Selective Catalytic Reduction (SCR) system in a diesel engine. The precise 32.5% concentration is crucial for the fluid's ability to convert harmful nitrogen oxide (NOx) emissions into harmless nitrogen gas and water.
Key Components
Urea:
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A synthetic, nitrogen-based compound that is chemically produced from ammonia and carbon dioxide.
Deionized Water:
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Ultra-pure water that has had all mineral ions removed, preventing damage to the engine's emissions system.
Why these ingredients?
For NOx Reduction:
Urea is the key ingredient that, when injected into a diesel engine's exhaust, reacts with the heat to produce ammonia. The ammonia then reacts with harmful NOx gases in the SCR catalyst to break them down into water and nitrogen.
For Purity:
The deionized water acts as a solvent and carrier for the urea, ensuring a stable and homogeneous solution. It's purified to prevent mineral deposits that could damage the sensitive SCR system.
Important Notes
Synthetic Production:
While urea is technically a component of urine, the urea used in DEF is synthetically produced for commercial use.
Adherence to Standards:
DEF quality is regulated by standards like ISO 22241 to ensure safety and performance.
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Is all DEF equal?
