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 DEF Urea is unsuitable for bulk transports as contaminations would endanger the purity and the final quality of the finished solutions.