Diesel exhaust fluid (DEF) is an aqueous urea solution made with 32.5 percent high-purity urea (AUS 32) and 67.5 percent deionized water. DEF is used as a consumable in Selective Catalytic Reduction (SCR) in order to lower NOx concentration in the diesel exhaust emissions from diesel engines.

PRODUCT SPECIFICATION SHEET
Urea Liquor 50% DEF Grade
Typical Chemical Analysis
Parameter Specification
Urea Concentration, wt.% 50.0 +- 1.0
Free Ammonia (alkalinity), wt.% 0.31 max
Biuret, wt.% 0.46 max

Parameter Typical
Urea Concentration 32.5 +- 0.7 %
Density at 20 oC 1087.0 -1093.0 kg/m3
Refractive Index at 20 oC 1.3814 �¢?? 1.3843
Free Ammonia (alkalinity) 0.2% max
Biuret 0.3% max
Aldehydes 5 ppm max
Insoluble Matter 20 ppm max
Phosphates 0.5 ppm max
Calcium 0.5 ppm max
Iron 0.5 ppm max
Copper 0.2 ppm max
Zinc 0.2 ppm max
Chromium 0.2 ppm max
Nickel 0.2 ppm max
Aluminum 0.5 ppm max
Magnesium 0.5 ppm max
Sodium 0.5 ppm max
Potassium 0.5 ppm max
Water Quality DEMIN ISO 3696 Applicable