Urea 46% Nitrogen 2 min technical read SEO Score: 92/100

Technical Grade Low-Biuret Urea for DEF and AdBlue Emission Fluid Production

STANDARDS: ASTM D4239 • ISO 5315 • SGS Draft Survey • UCP 600

Autonomous Verification: 2026-10-30

Executive Summary & Key Takeaways

Technical urea AdBlue grade (automotive urea, CAS 57-13-6, HS Code 3102.10) is an ultra-pure, unconditioned crystalline or prilled carbamide manufactured strictly to ISO 22241-1 specifications, featuring zero formaldehyde anti-caking additives, biuret below 0.3% (solution basis), aldehydes under 5 ppm, and trace metals below 0.5 ppm for SCR diesel exhaust systems.

Overview and Global Trade Significance of Technical Urea Adblue

In high-volume B2B bulk commodity markets, procuring certified technical urea AdBlue requires rigorous oversight of chemical purity, cargo friability, and port loading efficiency. Akok Global Trading manages complete supply chains linking certified production refineries with global discharge terminals.

Core Chemical & Technical Specifications

Guaranteed Quality: Min 46.2% N
Primary Industrial Application: Selective Catalytic Reduction (SCR) diesel emissions
Verified Independent Inspection: SGS, Intertek, or Saybolt at loading port
Customs Tariff Classification: HS Code 3102.10

Bulk Marine Logistics and Incoterms Execution

Ocean fixtures are executed under standard Gencon charter parties for Handysize and Supramax bulk carriers. Strict adherence to Notice of Readiness (NOR) and Statement of Facts (SOF) ensures continuous loading rates of 3,000 to 5,000 MT PWWD SHINC, actively preventing demurrage exposure.

Frequently Asked Questions (FAQ)

What is the standard minimum order quantity (MOQ)?

For ocean-going bulk vessel parcels, the minimum contract volume is 5,000 MT. For containerized cargo packed in 1.0 MT jumbo bags, MOQ is 500 MT.

How is cargo quality verified prior to payment release?

Independent inspection agencies (SGS or Saybolt) perform draft surveys and continuous composite sampling to issue official Certificates of Quality and Weight required under Letter of Credit (L/C) terms.

Technical Specifications Comparison

Chemical Impurity / Parameter	ISO 22241-1 AUS 32 (32.5% Solution)	Equivalent Solid Technical Urea (100% Basis)	Standard Agricultural Urea 46% N	ISO 22241-2 Test Protocol
Urea Content / Total Nitrogen	31.8% - 33.2% w/w urea solution	Min 46.3% - 46.6% N (99.5% purity)	Min 46.0% N	ISO 22241-2 Annex B / C
Biuret Impurity Limit	Max 0.30% w/w	Max 0.65% - 0.85% w/w dry basis	Max 1.00% w/w	ISO 22241-2 Annex E (Photometric)
Aldehydes (as Formaldehyde HCHO)	Max 5.0 mg/kg (5 ppm)	Max 10 - 15 ppm (Strictly Uncoated)	3,500 - 5,000 ppm (0.35% - 0.50%)	ISO 22241-2 Annex F
Insoluble Matter	Max 20 mg/kg (20 ppm)	Max 40 - 50 ppm	100 - 500 ppm	ISO 22241-2 Annex G (0.8 um Filter)
Alkalinity (as Free NH3)	Max 0.20% w/w	Max 0.15% - 0.30% w/w	Max 0.50% w/w	ISO 22241-2 Annex D (Titration)
Phosphate (PO4) Content	Max 0.50 mg/kg (0.5 ppm)	Max 1.0 - 1.5 ppm	10 - 50 ppm (Cross-contamination)	ISO 22241-2 Annex H
Ca, Fe, Cu, Zn, Cr, Ni, Al, Mg, Na, K	Max 0.2 to 0.5 mg/kg each	Max 0.5 to 1.2 ppm each	5 - 100 ppm	ISO 22241-2 Annex I (ICP-OES)

Frequently Asked Questions

Why can't agricultural urea 46% be dissolved to manufacture AdBlue or DEF?

Agricultural urea is treated with 3,500 to 5,000 ppm (0.35% to 0.50%) formaldehyde or fatty amine anti-caking coatings and handled in bulk facilities containing phosphate and calcium dust. These contaminants clog diesel dosing injectors and irreversibly poison SCR vanadium/zeolite catalysts.

What is the exact chemical composition of AUS 32 (AdBlue / DEF) and AUS 40 (Marine DEF)?

Automotive AUS 32 consists of 32.5% by weight ISO 22241 technical grade urea dissolved in 67.5% demineralized water ( forming a eutectic mixture with a -11.5 deg C freezing point). Marine AUS 40 contains 40.0% technical urea for IMO Tier III ocean vessel SCR systems.

How do trace metals like Calcium, Iron, and Sodium damage SCR exhaust catalysts?

In the 250 to 450 deg C exhaust stream, alkali and alkaline-earth cations (Na, K, Ca, Mg) migrate into the micropores of copper-zeolite or vanadium-titanium SCR catalysts, neutralizing acid active sites and causing permanent thermal sintering and NOx conversion failure.

How is technical urea packaged to avoid contamination during CIF marine transport?

Unlike agricultural urea shipped in open bulk holds, technical grade AdBlue urea is packed directly at the synthesis plant into virgin food-grade polyethylene-lined 1,000 kg (1.0 MT) FIBC jumbo bags or hermetically sealed 20ft FCL container liners.