AdBlue® is also called DEF, AUS32, or Aqueous Urea Solution 32.5% which is used with the Selective Catalytic Reduction system (SCR) to reduce emissions of oxides of nitrogen from the exhaust of diesel vehicles. AdBlue® is a 32.5% solution of high-purity urea in de-mineralized water which is clear, non-toxic and safe to handle. It is non explosive, non flammable and non harmful to the environment.

AdBlue® is classified under the minimum risk category of transportable fluids. It is not a fuel, nor a fuel additive and needs to be used in a dedicated tank in your heavy-duty vehicle. It is replenished in a similar way to refuelling diesel. If you spill AdBlue®on your hands, simply wash it off with water.