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Marine-grade AdBlue®, commonly known as AUS 40 (Aqueous Urea Solution 40%), is a high-purity urea solution specially designed for marine engines and vessels equipped with Selective Catalytic Reduction (SCR) systems.
While standard AdBlue® used in cars and trucks is a 32.5% urea solution (AUS 32), marine engines require a higher concentration to meet stricter emission standards (such as IMO Tier III) and for larger engine efficiency.
Key Characteristics of Marine Urea (AUS 40)
- Concentration: Contains 40% high-purity urea and 60% deionized water.
- Purpose: Injected into the exhaust system of marine engines to convert nitrogen oxides () into harmless nitrogen and water.
- Compliance: Adheres to international marine emission regulations and standards such as ISO 18611.
- Non-Toxic: The solution is non-hazardous and safe for the environment.
Benefits & Technical Details
- Efficiency: The 40% concentration is more efficient for the large engines and heavy fuel oils often used in shipping.
- No Other Additives: Typically, this is pure urea mixed with pure water, designed specifically to avoid damaging SCR catalysts.
- Anti-Crystallization: Some Marine DEF products feature additives that help reduce urea crystal formation in the injector, which can occur during low-load operation.
- Density: The solution generally has a specific weight of about at.
Storage and Handling
- Material Compatibility: Marine urea is corrosive to some metals; it must be stored in specialized materials like high-density polyethylene (HDPE) or stainless steel.
- Temperature Sensitivity: It is stable but should be kept away from direct sunlight and extreme temperatures to maintain its 12-month shelf life.
For maritime operations, using AUS40 Marine Urea is essential for maintaining compliance and engine health, particularly in Emission Control Areas (ECAs).
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