Scr urea

For SCR (Selective Catalytic Reduction) systems, the urea must meet the ISO 22241 standard. This ensures the purity levels necessary to prevent damage to the vehicle's catalytic converter. Key parameters include a urea concentration of 32.5% (when mixed in solution) and extremely low levels of impurities like biuret (max 0.3%), aldehydes, and heavy metals. Always request a COA (Certificate of Analysis) for every batch.

SCR Urea is typically supplied as high-purity granules or prills. Granular urea is often preferred for bulk transport due to its higher crushing strength, which reduces dust formation during handling. It must be stored in a cool, dry, and well-ventilated area, away from direct sunlight and temperatures exceeding 30°C, as high heat can cause the urea to decompose and release ammonia.

If you are purchasing solid urea to create a solution locally, you must use deionized or distilled water. Using tap water or mineral water will introduce calcium, magnesium, and chlorides, which will poison the SCR catalyst and lead to expensive system failures and increased NOx emissions.

The primary usage scenario is in heavy-duty diesel vehicles (trucks, buses), construction machinery, and maritime vessels to comply with environmental regulations like Euro IV, V, and VI or EPA Tier 4. It is also used in stationary power plants to reduce nitrogen oxide emissions from industrial boilers.

The biggest risk is contamination during transit. Even a tiny amount of fuel, oil, or non-stainless steel metal contact can ruin a shipment. Ensure the supplier uses dedicated liners or IBC tanks. Additionally, urea prices are highly volatile due to natural gas price fluctuations and government export quotas; always confirm the validity period of a quote.

Focus on long-term supply stability rather than just the lowest price. Ask for third-party inspection reports (SGS or Intertek) before loading. For large volumes, negotiate tiered pricing based on annual tonnage and request packaging customization (e.g., 1,000kg jumbo bags vs. 25kg bags) to optimize container space.

While technical grade urea is generally non-hazardous, some customs authorities may require a Non-Hazardous Chemical Declaration or an MSDS (Material Safety Data Sheet). Ensure the HS Code used is 31021000, and verify if your country imposes anti-dumping duties on urea originating from specific regions.

Utilize the Secured Trading services on Made-in-China.com to protect your payment until the goods are shipped. Conduct a factory audit or hire a local agent to verify the supplier's production capacity and ISO certifications to ensure they are a legitimate manufacturer and not a middleman with no quality control.