BlueDEF® diesel exhaust fluid is the mixture of high purity synthetic urea and deionized water that is used in Selective Catalytic Reduction (SCR) systems on diesel engines. BlueDEF® is injected into the exhaust stream via a controlled dosing module where the water vaporizes leaving ammonia molecules free to travel in to the catalytic converter where it reacts and neutralizes the NOx molecules, converting it to nitrogen and water vapor – two harmless and natural components of the air we breathe. BlueDEF® is available in bulk, packaged sizes or as a dispensing solution for smaller fleets. BlueDEF® meets or exceeds the highest international purity standards and is backed by a comprehensive warranty program. BlueDEF® is also non-hazardous and has a shelf life of several years, making it a safe and convenient solution for reducing NOx emissions. BlueDEF® is an important part of the effort to reduce emissions from diesel engines and help protect our environment.