Industrial Solutions

NOxCare 40 (AUS 40) Urea Solution

The proven technology to reduce NOx emissions from marine engines is SCR (selective catalytic reduction). In order to operate, a ship’s SCR system requires a high purity urea solution. Yara is the market leader in producing and distributing specific urea solutions used as reagents in NOx reduction technologies, across the globe. For the maritime sector, Yara offers their NOxCare 40 brand which is non-toxic, safe to handle, transport and store, making it practical for use in maritime vessels equipped with SCR systems.

NOxCare 40 for NOx control:

  • meets the ISO standard implemented for Urea Solution for Marine SCR applications
  • is produced by Yara, one of the world’s largest urea producer, thus securing product supply
  • is available worldwide
  • is non-toxic, safe and easy to transport, store and handle
  • has unmatched levels of quality to ensure longevity of the SCR catalyst
  • verifies product batches according to the highest industry standards
  • has strict quality control procedures throughout its logistics chain

It is essential that the reagent used meets ISO 18611 as the systems are sensitive to potential chemical impurities in the urea solution. Small amounts of contaminant can severely impact the performance of the SCR system and can ruin the catalyst elements. The quality of the urea solution needs to be specified to ensure reliable and stable operation of the SCR system. The ISO 18611 series provide the specification of urea solution for quality, handling, transportation and storage. Throughout the NOxCare 40 production and distribution procedures ISO 18611 is always adhered to.

Why use NOxCare 40% urea solution for NOx reduction in marine vessels?

Some companies who produce AUS 32.5% for the automotive market, also try to sell their product to the maritime industry. We do not recommend the use of AUS32.5%, which is the reagent currently used in automotive vehicles.

The advantage of 32,5 % urea solution is that it has a freezing point at -11 °C whilst 40% urea solution has a freezing point at 0°C. However, onboard vessels, the urea solution tank is normally located below the sea surface level. Consequently, contrary to vehicles’ urea product, it will rarely or never be exposed to temperatures below 0 °C and this allows for a higher concentration of urea in the solution to be used. This yields better economy for the vessels because one carries less water and more urea.

It is more economical
It ensures longevity of the SCR catalyst
  • fewer refuellings needed 
  • lower logistics (delivery) costs 
  • the need to store and carry less water content results in lower operational costs
There is a greater percentage of high purity urea - the active compound needed for chemical conversion in the SCR system

How is NOxCare 40 (AUS40) made available to refill ships with SCR systems?

Ferries and Cruise ships
Supply vessels or other coastal vessels
Tankers, cargo and other deep sea vessels
Fixed departure times and points, can be supplied by full truckloads or containers directly from our production sites or local storage tanks Refill at offshore bases or bunker stations Refill when they leave/arrive at port. This can either be done by full truckloads or containers directly from production sites or local storage tanks

Where port entry is unauthorized or the ship is too large, we can arrange trans-shipment using barges, supply vessels or tankers to your vessel.

We use cookies on this website. If you continue to use the site without changing your settings, you agree that we may store and access these cookies on your device. To understand more about our use of cookies and to change cookie settings at any time please see
Cookie Preferences
I accept cookies