Overview
AUS40 Urea Solution, also known as AdBlue or DEF, is a standardized 32.5% urea solution in deionized water, designed for use in SCR systems. It reacts with NOx emissions in diesel exhaust to form harmless nitrogen and water, meeting Euro IV/V/VI and EPA Tier 4 emission standards. Developed as part of global efforts to reduce air pollution, AUS40 is widely adopted in automotive, marine, and industrial diesel engines. Its formulation ensures optimal performance in SCR catalysts while preventing crystallization in cold climates.
Physical and Chemical Properties
The solution exhibits near-neutral pH (8-9) and a density slightly higher than water due to urea content. It freezes at -11°C but remains chemically stable upon thawing. Unlike pure urea, the aqueous form prevents solid deposits in SCR systems. Key chemical stability is maintained under recommended storage conditions. The solution is incompatible with strong oxidizers or copper alloys, which may degrade its effectiveness. Its low conductivity and high purity minimize corrosion risks in SCR hardware.
Main Applications
Primary application is in SCR-equipped diesel vehicles (trucks, buses, agricultural machinery) to meet emission regulations. It’s also used in stationary diesel generators, locomotives, and marine engines. Industrial applications include NOx reduction in power plants and manufacturing facilities. The automotive sector accounts for 80% of global demand, with consumption typically ranging from 3-6% of diesel fuel usage. Emerging markets in Asia and Latin America are driving growth due to tightening emission norms.
Safety and Storage
Classified as non-hazardous under GHS, though minor skin/eye irritation may occur. Spills should be rinsed with water and don’t require special containment. Storage tanks must be polyethylene or stainless steel to prevent contamination. Bulk storage requires temperature control to prevent freezing or urea decomposition above 30°C. Shelf life is typically 12-18 months when stored properly. Opened containers should be used within 6 months to maintain purity.
B2B Procurement Guide
Procure from ISO 22241-certified manufacturers to ensure adherence to DIN 70070 standards. Key evaluation criteria include: urea purity (>99.5%), biuret content (<0.3%), and aluminum levels (<0.8 ppm). Bulk shipments (IBCs or tankers) offer 15-30% cost savings versus packaged goods. Verify supplier logistics for temperature-controlled transport. Contracts should specify testing protocols for density, pH, and contamination upon delivery.
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