Diesel Exhaust Fluid (DEF)
Diesel Exhaust Fluid (DEF) is a reactant which plays a big role in SCR process. It is a nontoxic and aqueous solution of 67.5% water and 32.5% urea. The urea is a chemical compound of nitrogen that turns to ammonia at the time of heating. DEF is extensively used in a number of industries commonly in agriculture and fertilizer.
The fluid is neither dangerous nor inflammable while handling. But it is extremely corrosive to metal, especially aluminum and copper.
Diesel Exhaust Fluid (DEF) Handling
While handling the DEF solution, it is essential that process connectors be properly connected or accurately encapsulated. Otherwise there can be a risk that DEF may cause oxidation that cannot be noticeable. Compressed air or water does not work as DEF oxidizes metal very quickly.
In case a connector comes in contact with the DEF solution, it is necessary to be rinsed without wasting any time to avoid DEF solution from creeping into the copper wiring.
What You Should Know about Spilled Diesel Exhaust Fluid (DEF)
If the DEF solution is completely spilled onto any vehicle, make sure to wipe off the rinse and excess with water. The spilled DEF solution can create white crystals on your vehicle. So, it is better to rinse off such crystals with water.
If the urea solution comes in contact with your skin, rinse with water and try to remove the contaminated clothing.