DAUER DEF, as required by regulations, is a urea solution with a purity of 32.5% and is formulated to be used in SCR emission control systems and thus optimally helps to reduce nitrogen oxide emissions. It is designed for use in trucks and automobiles manufactured after 2010. This product is certified by the American Petroleum Institute (API). DAUER DEF Meets ISO 22241-2 specifications and meets all applicable standards and specifications for use in all SCR systems.