For now, all we know is that only EPA 2010 commercial and consumer vehicles equipped with Selective Catalytic Reduction (SCR) technology will use Diesel Exhaust Fluid. Diesel Exhaust Fluid, also called DEF, is a solution made up of purified water and 32.5 percent automotive-grade urea that is used as a carrying agent for the ammonia needed to reduce nitrogen oxide (NOx) emissions from vehicles into nitrogen, water and carbon dioxide (CO2).
Diesel Exhaust Fluid is monitored for quality and certified by the American Petroleum Institute, ensuring that Diesel Exhaust Fluid is a stable, non-toxic, odorless and completely safe solution. The urea used for Diesel Exhaust Fluid is automotive-grade. Urea in additional forms is widely distributed for many other industrial and agricultural needs, including emissions control at public utilities and power plants.
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Below is a great diagram for Diesel Exhaust Fluid production and Supply process.- Image from Terra Industries.
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