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SCR technology is called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. The reducing agent reacts with NOx to convert the pollutants into nitrogen, water and tiny amounts of carbon dioxide (CO2) - natural elements common to the air we breathe everyday. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid, which can be rapidly hydrolyzed to produce the oxidizing ammonia in the exhaust stream.

Specification

 

No. Item National Standard
GB29518-2013
Method of analysis
1 Urea content w/% 31.8-33.2 Total Nitrogen
2 Density棩/(kg/m3) 1087.0-1093.0 SH/T 0604
3 Refraction nD20 1.3814-1.38 GB/T 614
4 Alkalinity w/% ≤0.2 GB/T 601
5 Biuret w/% ≤0.3 Spectrophotography
6 Aldehyde/(mg/kg) ≤5 Spectrophotography
7 Insoluble matter/(mg/kg) ≤20 Gravimetry
8 Phosphate/(mg/kg) ≤0.5 Spectrophotography
9 Calcium/(mg/kg) ≤0.5 Atomic Absorption Spectrometer
10 Iron/(mg/kg) ≤0.5 Atomic Absorption Spectrometer
11 Copper/(mg/kg) ≤0.2 Atomic Absorption Spectrometer
12 Zinc/(mg/kg) ≤0.2 Atomic Absorption Spectrometer
13 Chromium/(mg/kg) ≤0.2 Atomic Absorption Spectrometer
14 Nickel/(mg/kg) ≤0.2 Atomic Absorption Spectrometer
15 Aluminum/(mg/kg) ≤0.5 Atomic Absorption Spectrometer
16 Magnesium/(mg/kg) ≤0.5 Atomic Absorption Spectrometer
17 Sodium/(mg/kg) ≤0.5 Atomic Absorption Spectrometer
18 Pattasium/(mg/kg) ≤0.5 Atomic Absorption Spectrometer
19 Consistency Conform Chromatograph
20 ChlorideCl/(mg/kg) Not required Colorimetry
21 PhosphateCO2/w/w% Not required Colorimetry

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