About ClearBlue-DEF™(Aqueous Urea Solution 32.5%)What is ClearBlue-DEF™and Why Is It Needed?ClearBlue-DEF™ is an aqueous urea solution manufactured by Greensafe Australia Pty Ltd for use in vehicles fitted with SCR technology. ClearBlue-DEF™is a clear and colourless solution made from urea and water. The solution is non-toxic and safe to handle. Only high purity urea and ultrapure water are used to manufacture the ClearBlue-DEF™ solution which ensures that ClearBlue-DEF™is free from contamination and meets the international quality standard for SCR-DEF solutions, ISO 22241-1.How Does It Work - The ProcessWhat is SCR?Selective catalytic reduction is a process that most heavy duty vehicle manufacturers have adopted to reduce nitrous oxide (NOx) emission from the exhaust of diesel engine vehicles. This technology was introduced to meet tough new emissions standards in Europe which are called Euro 5 and Euro 6. Australian emission standards for heavy vehicles are based on European regulations and the Euro 5 standard was mandated in Australia in January 2011. How does it work?ClearBlue-DEF™, stored in a separate tank located beside the diesel tank which has a distinctive blue lid (Figure 1), is injected into the exhaust gases before they pass through an SCR catalytic converter. It is here that the ClearBlue-DEF™solution decomposes into ammonia (NH3) and carbon dioxide (CO2). In the catalytic converter the nitrogen oxides (NOx) in the diesel emissions are converted to harmless nitrogen (N2) and water (H2O) when mixed with the ammonia (NH3). See Figure 2. ClearBlue-DEF™is dosed into the SCR system at a rate equivalent to 3-5% of the diesel consumption.Manufacturing and Quality ControlThe Greensafe WayClearBlue-DEF™ is manufactured and tested by qualified industrial chemists whose combined experience totals 30 years. Each batch of ClearBlue-DEF™is tested using a refractometer specifically designed to measure the aqueous urea solution (Figure 3). This ensures that each batch meets the ISO 22241-1 requirement of 32.5±0.7% urea.