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APP FACTS ABOUT DEF > Back to DEF Main Page What is Diesel Exhaust Fluid (DEF)? Diesel Exhaust Fluid (DEF) is a solution made up of purified water and 32.5 percent urea that is used as a carrying agent for the ammonia needed to reduce nitrogen oxide (NOx) emissions from diesel engines into nitrogen, water and carbon dioxide (CO2). How DEF works within an SCR system is to treat the exhaust gas downstream of the engine. Small quantities of DEF are injected into the exhaust stream. When mixed with the NOx, it changes into harmless nitrogen and water. 2.5 gallons of DEF will yield over 800 miles of travel. You can drive from L.A. to Boston and back on less than a single 23-gallon tank of it (estimated usage rate is approximately 2% per gallon of fuel). EXAMPLES OF SCR TECHNOLOGY 
DEF will freeze beginning at 11° F. The SCR system is designed to provide heating for the tank and supply lines which will reduce the melting time for frozen DEF. If the DEF freezes when the vehicle is shut down, start up and normal operation of the vehicle will not be inhibited. The SCR heating system is designed to quickly return the DEF to liquid form and the operation of the vehicle will not be impacted. DEF is a non-toxic, non-polluting, and non-flammable substance. Therefore, it is safe to handle and store and poses no serious risk to humans, animals, equipment, or the environment when handled properly. Storage is recommended between 10°F - 90°F. In cold temperatures it’s recommended to store DEF in a storage unit, in warm temperatures it’s recommended to store in a shaded area. Product Spec Sheet (PDF) > Click here to download MSDS Sheet (PDF) > Click here to download |
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