Urea Solution/ AUS32/ Diesel exhaust fluid
Diesel exhaust fluid (also known as AUS 32 and as AdBlue) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. DEF is consumed in selective catalytic reduction (SCR) that lowers the concentration of nitrogen oxides (NOx) in the diesel exhaust emissions from a diesel engine.
Certificate of Analysis
(According to ISO 22241)
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Product Name |
AUS32/ Diesel exhaust fluid |
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Item |
Specification |
Unit |
Result |
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Urea |
31.8 – 33.2 |
% by weight |
32.5 |
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Appearance |
clear and colorless |
- |
clear and colorless |
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Crystallization point |
- 11.8 – -11.2 |
°C |
- 11.5 |
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Alkalinity as NH3 |
0.2 max. |
% by weight |
0.1 |
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Biuret |
0.3 max. |
% |
0.28 |
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Insolubles |
20 max. |
mg/kg |
10.00 |
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Aldehyde |
5 max. |
mg/kg |
4 |
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Phosphate (PO4) |
0.5 max. |
mg/kg |
0.24 |
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Al |
0.5 max. |
mg/kg |
0.12 |
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Ca |
0.5 max. |
mg/kg |
0.39 |
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Fe |
0.5 max. |
mg/kg |
0.50 |
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Cu |
0.2 max. |
mg/kg |
<0.01 |
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Zn |
0.2 max. |
mg/kg |
<0.01 |
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Cr |
0.2 max. |
mg/kg |
<0.01 |
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Ni |
0.2 max. |
mg/kg |
<0.01 |
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Mg |
0.5 max. |
mg/kg |
0.49 |
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Na |
0.5 max. |
mg/kg |
0.10 |
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K |
0.5 max. |
mg/kg |
0.47 |
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Density at 20°C |
1.087 – 1.093 |
kg/m3 |
1.090 |
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Refractive index at 20°C |
1.3814 – 1.3843 |
- |
1.3828 |
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