Reductant for SCR Reductant for SCR Properties Reductant is a urea solution normally known as AdBlue, DEF or ARLA 32 depending on the market. With SCR, the reductant is added to the exhaust gases before the catalytic converter. This reduces nitrogen oxide emissions. Reductant in accordance with ISO 22241 is a solution consisting of urea and water containing 32.5% by weight of urea. The solution freezes at approximately -11°C. When the solution freezes, ice and urea always maintain the same concen- tration. Always store reductant at a temperature between -11°C and 30°C. Responsibility and quality re- quirements IMPORTANT! Reductant is normally colourless if no dye has been added.
It is not harmful to the skin. Nor is it toxic in small quantities, but it tastes very un- pleasant. The machine operator is responsible for using the correct type of reductant to ensure that local laws are complied with. Reductant has a low surface tension and rapidly spreads over large areas, which then become very slippery. Reductant is extremely corrosive, especially to aluminium and copper. Therefore, wash off any spillages on metal and electrical connections as soon as possible. Water works very well for cleaning purposes. Please use hot water. REQUIREMENT!
In order for the emission control to meet the emission requirements set by the public authori- ties, the reductant should be specified in accord- ance with ISO 22241. Reductant can dry out and form white or greyish brown crystals or deposits. Dense deposits which have been formed as a result of heat may need to be scraped off or heated to more than 500°C. OPM 300 en-GB 74 © Scania CV AB 2015, Sweden Rec. % by weight of urea Limit value according to ISO 22241 32.5% 31.8-33.2%