Aqueous urea solutions AUS 40, AUS 32 are NOx reducing agents.

Aqueous urea solution AUS 32 reduces nitrogen oxide emission from auto exhaust system. The solution is injected to diesel engine exhaust systems before selective reduction catalyst, consequently due to the solution reaction with nitrogen oxide gasses emissions are converted to water vapour and nitrogen. This technology optimises engine performance by reducing particle emission and maximizing fuel energy generation.

Aqueous urea solution AUS 40 reduces nitrogen oxide emission from vessel or diesel engine exhaust system. The solution is injected to diesel engine exhaust system before selective reduction catalyst, consequently due to the solution reaction with nitrogen oxide gasses emissions are converted to water vapour and nitrogen.

Chemical characteristics of AUS32:

A.1 Chemical description of urea

Chemical formula: (NH2)2CO;

Molar mass: 60,06 g/mol;

CAS-Nr.: 57-13-6 (CAS : Chemical Abstracts Service).

A.2 Physical properties of AUS 32

Aspect: colourless clear liquid;

Incipient crystallization: -11.5 °C;

Viscosity (at 25 °C): approx. 1.4 mPa·s;

Thermal conductivity (at 25 °C): approx. 0.570 W/m·K;

Specific heat (at 25 °C): approx. 3.40 kJ/kg·K;

Surface tension (at 20 °C): min. 65 mN/m.

The common storage condition for AUS32 & AUS40:

Transportation of the Aqueous urea solution should be in insulated tanks or in plastic containers.Alloyed steels, various plastic materials and plastic-coated metal containers are suitable container materials.

Non-alloyed steels, copper, copper-containing alloys and zinc-coated steels should not be used. Any other material not cited above should be tested regarding corrosion resistance and possible influences on the product specification.

The Aqueous urea solution should leave the manufacturer for shipping at a temperature of 30 °C maximum.To avoid crystal precipitation or hydrolysis , storage at normal conditions (optimum up to 25 °C) is recommended.