It is the only type of Urea that meets the ISO 22241 specification (Uncoated, Aldehyde, heavy metals free) and the only suitable Urea for the production of AdBlue®/AUS32/ARLA32 solutions. For meeting the ISO 22241 the Urea needs to be of highest purity/quality. Automotive grade urea dissolved within deionized water is resulting in an aqueous urea solution, supporting the reduction of mono-nitrogen oxides exhaust emissions by injection into selective catalytic reduction systems of heavy duty engines. This aqueous urea solution is standardized as AUS 32 in ISO 22241 and consequently the technical specifications for automotive grade urea are derived from this standard. Urea Assay (wt %) 98.0 min 99.1 Granulate size 0.85-2.80mm 91% Moisture (wt %) 0.5 max 0.3 Nitrogen(wt %) 46 46.4 Biuret (wt %) 1.0 max 0.65 Aldehydes (ppm) 5 max 4 Free Ammonium (wt %) 0.01 0.01 Insolubles (ppm) 20 13 Fe (mg/kg) 0.5 max Less than 0.2 Al (mg/kg) 0.5max Less than 0.2 Cu (mg/kg) 0.5 max Less than 0.2 Zn (mg/kg) 0.5 max Less than 0.2 Cr (mg/kg) 0.5 max Less than 0.2 Ni (mg/kg) 0.5 max Less than 0.2 Mg (mg/kg) 0.5 max Less than 0.2 Na (mg/kg) 0.5max Less than 0.2 K (mg/kg) 0.5 max Less than 0.2 Ash (ppm) 100 max. Less than 10 Phosphate(ppm) 0.5 max Less than 0.2 Heavy Metal( ppm) 0.5 0.3 Additive NONE NONE