DEF is a clear, non-toxic, non-flammable, and nonhazardous organic compound consisting of 32.5% urea and 67.5% de-ionized water that requires no special handling.
Non-toxic Non-flammable Non-hazardous Organic
Why use Diesel Exhaust Fluid (DEF)?
To achieve the nitrogen oxide (NOX) levels required by the EPA 2010 standard, most engine manufacturers are utilizing Selective Catalytic Reduction (SCR) systems that require the addition of DEF. Off-road engines will be impacted by similar emission standards which began in 2014.