What is AdBlue / DEF?
AdBlue & Diesel exhaust fluid (DEF) is one of the key elements in the SCR process. It’s a nontoxic solution of 67.5%. water and 32.5% automotive grade urea. AdBlue / DEF helps to convert NOx into nitrogen gas and water vapor. It is stable, colorless, odorless, and meets accepted international standards of purity and comoposltion.                                                           
How does SCR work?
To reduce NOx, a small amount of urea-based solution called diesel exhaust fluid (DEF) is injected directly into the exhaust upstream of a catalyst. The AdBlue/DEF vaporizes and decomposes to form ammonia (NH3), which in conjunction with the SCR catalyst, reacts with NOx to convert the pollutant into nitrogen (N2) and water (H2O). This means that trucks will have to carry a sufficient quantity of AdBlue/DEF on-board.
Depending upon the capacity of the AdBlue/DEF tank, the SCR system is expected to add 300- 400 pounds to the weight of a Class 8 truck.
What is urea?
Urea is a common agricultural fertilizer that is usually manufactured from natural gas. The amount of urea that will be used in motor vehicle applications is a small fraction of the urea used for agricultural purposes. Urea is a solid at room temperature.                                                           
Are there specific temperatures at which AdBlue ?
Yes. When stored between 10 and 90 degrees Fahrenheit, DEF should last at least one year. DEF freezes below 12 degrees Fahrenheit. The efficacy of DEF is not altered as a result of freezing and subsequent thawing. DEF is also sensitive to heat and should be stored below 86 degrees Fahrenheit. Exposing DEF to heat for an extended period of time will reduce its shelf life - if stored continuously at 90 degrees Fahrenheit, DEF shelf life is reduced to 6 months.                                                           
AdBlue/DEF and diesel will be confused?
Cylinder diesel nozzle diameter of the cylinder is larger than AdBlue / DEF injection pipeline, so diesel will not be injected into the cylinder AdBlue/ DEF. On the contrary the situation will never arise because there are a AdBlue/ DEF cylinder magnets, magnet can only open AdBlue / DEFnozzle valve. No-cylinder diesel magnet, AdBlue/ DEF nozzle valve would not be opened, it will not AdBlue/ DEF injection-cylinder diesel.                                                           
How much DEF is required (dosing)?
DEF for us Application is 2-3%, but 4-6% for Eropean Engines. engine manufacturers have stated that their SCR systems will require a 2%-6% AdBlue / DEF dosing rate compared to the amount of diesel consumed. This works out one gallon of AdBlue / DEF required for every 300 miles traveled (assuming fuel economy of 6 mpg). At this rate, a heavy duty truck traveling 120,000 miles annually would require approximately 400 -600 gallons of AdBlue / DEF per year. Note, trucks manufactured for sale in Europe do not use EGR with their SCR systems, so their AdBlue / DEF dose rates are higher.
Trucks are expected to have on-board urea tanks that range in size from 15-30 gallons. With this capacity, it will not be necessary to add AdBlue / DEF each time the truck refuels.                                                           
How about the AdBlue/DEF QC?
For assuring our clients of the best quality, each batch of AdBlue/DEF has to be inspected by a valuable instrument (Inductive coupled plasma) before shipping, thus the contents of the impurities are under well controlled and detected. Base on this inspection, your SCR system is protected, not only reducing the emissions but also extending the lifetime of your vehicle.                                                           
Forgot to increase the impact of the engine
Yes, it will affect the engine power and efficiency of emissions. But with the SCR system on commercial vehicles, contain AdBlue the meter, as soon as possible to provide car owners to add AdBlue.                                                           
What is Diesel Exhaust Fluid, or DEF?
Diesel Exhaust Fluid (DEF) is general public product name of north america, is a reactant that’s key to the SCR process. It’s a nontoxic, aqueous solution of 32.5% urea and 67.5% water.
DEF = AdBlue