​DEF is a clear, non-toxic, and biodegradable solution that consists of purified water and automotive-grade urea (typically 32.5% urea and 67.5% deionized water). The purity of DEF is crucial to ensure proper operation of the SCR system.
​ DEF is typically stored in a separate tank in diesel-powered vehicles and equipment. It should be stored in a cool, dry place and protected from direct sunlight. When handling DEF, it’s important to use dedicated equipment, as it should not come into contact with other substances.
​ DEF is a straightforward process. Many diesel vehicles have a designated filler cap for DEF, and it can be refilled using a nozzle at DEF dispensing stations or via containers designed for this purpose.
​The consumption rate of DEF varies depending on the size and usage of the diesel engine. On average, it is consumed at a rate of approximately 3-5% of diesel fuel consumption, but this can vary.
​: DEF is an integral part of the SCR system, which includes components like the catalyst, injector, and sensors. These components work together to convert NOx into nitrogen and water vapor.
​ Modern diesel vehicles equipped with DEF systems have onboard computers that continuously monitor the DEF level and the exhaust emissions, ensuring proper operation and compliance with emission standards.​