DEF Facts - The Facts About the Fluid

Diesel Exhaust Fluid (DEF), one of the key elements involved in the SCR process, is a solution of purified water and 32.5% automotive-grade urea.  When combined with the heat of the exhaust stream and the SCR catalyst, DEF helps convert NOx into harmless nitrogen and water vapor. DEF is non-toxic and non-flammable and it will not harm people, animals, equipment or the environment when handled properly.

Cummins brings more than a decade of experience in building SCR systems and is on the forefront of engine technology using DEF.